| Message ID | 1445295114-20921-1-git-send-email-laurent.pinchart+renesas@ideasonboard.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Tue, Oct 20, 2015 at 01:51:54AM +0300, Laurent Pinchart wrote: > The drm driver .load() operation is prone to race conditions as it > initializes the driver after registering the device nodes. Its usage is > deprecated, inline it in the probe function and call drm_dev_alloc() and > drm_dev_register() explicitly. > > For consistency inline the .unload() handler in the remove function as > well. > > Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> > --- > drivers/gpu/drm/rcar-du/rcar_du_drv.c | 184 ++++++++++++++++-------------- > drivers/gpu/drm/rcar-du/rcar_du_hdmicon.c | 11 +- > drivers/gpu/drm/rcar-du/rcar_du_lvdscon.c | 11 +- > drivers/gpu/drm/rcar-du/rcar_du_vgacon.c | 11 +- > 4 files changed, 104 insertions(+), 113 deletions(-) > > diff --git a/drivers/gpu/drm/rcar-du/rcar_du_drv.c b/drivers/gpu/drm/rcar-du/rcar_du_drv.c > index bebcc97db5e5..46d628752371 100644 > --- a/drivers/gpu/drm/rcar-du/rcar_du_drv.c > +++ b/drivers/gpu/drm/rcar-du/rcar_du_drv.c > @@ -119,82 +119,6 @@ MODULE_DEVICE_TABLE(of, rcar_du_of_table); > * DRM operations > */ > > -static int rcar_du_unload(struct drm_device *dev) > -{ > - struct rcar_du_device *rcdu = dev->dev_private; > - > - if (rcdu->fbdev) > - drm_fbdev_cma_fini(rcdu->fbdev); > - > - drm_kms_helper_poll_fini(dev); > - drm_mode_config_cleanup(dev); > - drm_vblank_cleanup(dev); > - > - dev->irq_enabled = 0; > - dev->dev_private = NULL; > - > - return 0; > -} > - > -static int rcar_du_load(struct drm_device *dev, unsigned long flags) > -{ > - struct platform_device *pdev = dev->platformdev; > - struct device_node *np = pdev->dev.of_node; > - struct rcar_du_device *rcdu; > - struct resource *mem; > - int ret; > - > - if (np == NULL) { > - dev_err(dev->dev, "no platform data\n"); > - return -ENODEV; > - } > - > - rcdu = devm_kzalloc(&pdev->dev, sizeof(*rcdu), GFP_KERNEL); > - if (rcdu == NULL) { > - dev_err(dev->dev, "failed to allocate private data\n"); > - return -ENOMEM; > - } > - > - init_waitqueue_head(&rcdu->commit.wait); > - > - rcdu->dev = &pdev->dev; > - rcdu->info = of_match_device(rcar_du_of_table, rcdu->dev)->data; > - rcdu->ddev = dev; > - dev->dev_private = rcdu; > - > - /* I/O resources */ > - mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); > - rcdu->mmio = devm_ioremap_resource(&pdev->dev, mem); > - if (IS_ERR(rcdu->mmio)) > - return PTR_ERR(rcdu->mmio); > - > - /* Initialize vertical blanking interrupts handling. Start with vblank > - * disabled for all CRTCs. > - */ > - ret = drm_vblank_init(dev, (1 << rcdu->info->num_crtcs) - 1); > - if (ret < 0) { > - dev_err(&pdev->dev, "failed to initialize vblank\n"); > - goto done; > - } > - > - /* DRM/KMS objects */ > - ret = rcar_du_modeset_init(rcdu); > - if (ret < 0) { > - dev_err(&pdev->dev, "failed to initialize DRM/KMS (%d)\n", ret); > - goto done; > - } > - > - dev->irq_enabled = 1; > - > - platform_set_drvdata(pdev, rcdu); > - > -done: > - if (ret) > - rcar_du_unload(dev); > - > - return ret; > -} > - > static void rcar_du_preclose(struct drm_device *dev, struct drm_file *file) > { > struct rcar_du_device *rcdu = dev->dev_private; > @@ -244,8 +168,6 @@ static const struct file_operations rcar_du_fops = { > static struct drm_driver rcar_du_driver = { > .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_PRIME > | DRIVER_ATOMIC, > - .load = rcar_du_load, > - .unload = rcar_du_unload, > .preclose = rcar_du_preclose, > .lastclose = rcar_du_lastclose, > .set_busid = drm_platform_set_busid, > @@ -308,18 +230,114 @@ static const struct dev_pm_ops rcar_du_pm_ops = { > * Platform driver > */ > > -static int rcar_du_probe(struct platform_device *pdev) > +static int rcar_du_remove(struct platform_device *pdev) > { > - return drm_platform_init(&rcar_du_driver, pdev); > + struct rcar_du_device *rcdu = platform_get_drvdata(pdev); > + struct drm_device *ddev = rcdu->ddev; > + > + mutex_lock(&ddev->mode_config.mutex); > + drm_connector_unplug_all(ddev); > + mutex_unlock(&ddev->mode_config.mutex); > + > + drm_dev_unregister(ddev); > + > + if (rcdu->fbdev) > + drm_fbdev_cma_fini(rcdu->fbdev); > + > + drm_kms_helper_poll_fini(ddev); > + drm_mode_config_cleanup(ddev); > + drm_vblank_cleanup(ddev); > + > + drm_dev_unref(ddev); > + > + return 0; > } > > -static int rcar_du_remove(struct platform_device *pdev) > +static int rcar_du_probe(struct platform_device *pdev) > { > - struct rcar_du_device *rcdu = platform_get_drvdata(pdev); > + struct device_node *np = pdev->dev.of_node; > + struct rcar_du_device *rcdu; > + struct drm_connector *connector; > + struct drm_device *ddev; > + struct resource *mem; > + int ret; > + > + if (np == NULL) { > + dev_err(&pdev->dev, "no device tree node\n"); > + return -ENODEV; > + } > + > + /* Allocate and initialize the DRM and R-Car device structures. */ > + rcdu = devm_kzalloc(&pdev->dev, sizeof(*rcdu), GFP_KERNEL); > + if (rcdu == NULL) > + return -ENOMEM; > + > + init_waitqueue_head(&rcdu->commit.wait); > > - drm_put_dev(rcdu->ddev); > + rcdu->dev = &pdev->dev; > + rcdu->info = of_match_device(rcar_du_of_table, rcdu->dev)->data; > + > + ddev = drm_dev_alloc(&rcar_du_driver, &pdev->dev); > + if (!ddev) > + return -ENOMEM; > + > + rcdu->ddev = ddev; > + ddev->dev_private = rcdu; > + > + platform_set_drvdata(pdev, rcdu); > + > + /* I/O resources */ > + mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); > + rcdu->mmio = devm_ioremap_resource(&pdev->dev, mem); > + if (IS_ERR(rcdu->mmio)) { > + ret = PTR_ERR(rcdu->mmio); > + goto error; > + } > + > + /* Initialize vertical blanking interrupts handling. Start with vblank > + * disabled for all CRTCs. > + */ > + ret = drm_vblank_init(ddev, (1 << rcdu->info->num_crtcs) - 1); > + if (ret < 0) { > + dev_err(&pdev->dev, "failed to initialize vblank\n"); > + goto error; > + } > + > + /* DRM/KMS objects */ > + ret = rcar_du_modeset_init(rcdu); > + if (ret < 0) { > + dev_err(&pdev->dev, "failed to initialize DRM/KMS (%d)\n", ret); > + goto error; > + } > + > + ddev->irq_enabled = 1; > + > + /* Register the DRM device with the core and the connectors with > + * sysfs. > + */ > + ret = drm_dev_register(ddev, 0); > + if (ret) > + goto error; > + > + mutex_lock(&ddev->mode_config.mutex); > + drm_for_each_connector(connector, ddev) { > + ret = drm_connector_register(connector); > + if (ret < 0) > + break; > + } > + mutex_unlock(&ddev->mode_config.mutex); I'm wondereding whether we shouldn't just wrap this up in a helper somehow, like drm_dev_modeset_register. Only trouble is that we might be racing with adding MST connectors already, and that's where I stopped thinking about it ;-) Anyway that aside aside: Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch> -Daniel > + > + if (ret < 0) > + goto error; > + > + DRM_INFO("Device %s probed\n", dev_name(&pdev->dev)); > > return 0; > + > +error: > + rcar_du_remove(pdev); > + > + return ret; > } > > static struct platform_driver rcar_du_platform_driver = { > diff --git a/drivers/gpu/drm/rcar-du/rcar_du_hdmicon.c b/drivers/gpu/drm/rcar-du/rcar_du_hdmicon.c > index 96f2eb43713c..6038be93c58d 100644 > --- a/drivers/gpu/drm/rcar-du/rcar_du_hdmicon.c > +++ b/drivers/gpu/drm/rcar-du/rcar_du_hdmicon.c > @@ -55,12 +55,6 @@ static const struct drm_connector_helper_funcs connector_helper_funcs = { > .best_encoder = rcar_du_connector_best_encoder, > }; > > -static void rcar_du_hdmi_connector_destroy(struct drm_connector *connector) > -{ > - drm_connector_unregister(connector); > - drm_connector_cleanup(connector); > -} > - > static enum drm_connector_status > rcar_du_hdmi_connector_detect(struct drm_connector *connector, bool force) > { > @@ -79,7 +73,7 @@ static const struct drm_connector_funcs connector_funcs = { > .reset = drm_atomic_helper_connector_reset, > .detect = rcar_du_hdmi_connector_detect, > .fill_modes = drm_helper_probe_single_connector_modes, > - .destroy = rcar_du_hdmi_connector_destroy, > + .destroy = drm_connector_cleanup, > .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, > .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, > }; > @@ -108,9 +102,6 @@ int rcar_du_hdmi_connector_init(struct rcar_du_device *rcdu, > return ret; > > drm_connector_helper_add(connector, &connector_helper_funcs); > - ret = drm_connector_register(connector); > - if (ret < 0) > - return ret; > > connector->dpms = DRM_MODE_DPMS_OFF; > drm_object_property_set_value(&connector->base, > diff --git a/drivers/gpu/drm/rcar-du/rcar_du_lvdscon.c b/drivers/gpu/drm/rcar-du/rcar_du_lvdscon.c > index 0c43032fc693..e905f5da7aaa 100644 > --- a/drivers/gpu/drm/rcar-du/rcar_du_lvdscon.c > +++ b/drivers/gpu/drm/rcar-du/rcar_du_lvdscon.c > @@ -62,12 +62,6 @@ static const struct drm_connector_helper_funcs connector_helper_funcs = { > .best_encoder = rcar_du_connector_best_encoder, > }; > > -static void rcar_du_lvds_connector_destroy(struct drm_connector *connector) > -{ > - drm_connector_unregister(connector); > - drm_connector_cleanup(connector); > -} > - > static enum drm_connector_status > rcar_du_lvds_connector_detect(struct drm_connector *connector, bool force) > { > @@ -79,7 +73,7 @@ static const struct drm_connector_funcs connector_funcs = { > .reset = drm_atomic_helper_connector_reset, > .detect = rcar_du_lvds_connector_detect, > .fill_modes = drm_helper_probe_single_connector_modes, > - .destroy = rcar_du_lvds_connector_destroy, > + .destroy = drm_connector_cleanup, > .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, > .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, > }; > @@ -117,9 +111,6 @@ int rcar_du_lvds_connector_init(struct rcar_du_device *rcdu, > return ret; > > drm_connector_helper_add(connector, &connector_helper_funcs); > - ret = drm_connector_register(connector); > - if (ret < 0) > - return ret; > > connector->dpms = DRM_MODE_DPMS_OFF; > drm_object_property_set_value(&connector->base, > diff --git a/drivers/gpu/drm/rcar-du/rcar_du_vgacon.c b/drivers/gpu/drm/rcar-du/rcar_du_vgacon.c > index e0a5d8f93963..9d7e5c99caf6 100644 > --- a/drivers/gpu/drm/rcar-du/rcar_du_vgacon.c > +++ b/drivers/gpu/drm/rcar-du/rcar_du_vgacon.c > @@ -31,12 +31,6 @@ static const struct drm_connector_helper_funcs connector_helper_funcs = { > .best_encoder = rcar_du_connector_best_encoder, > }; > > -static void rcar_du_vga_connector_destroy(struct drm_connector *connector) > -{ > - drm_connector_unregister(connector); > - drm_connector_cleanup(connector); > -} > - > static enum drm_connector_status > rcar_du_vga_connector_detect(struct drm_connector *connector, bool force) > { > @@ -48,7 +42,7 @@ static const struct drm_connector_funcs connector_funcs = { > .reset = drm_atomic_helper_connector_reset, > .detect = rcar_du_vga_connector_detect, > .fill_modes = drm_helper_probe_single_connector_modes, > - .destroy = rcar_du_vga_connector_destroy, > + .destroy = drm_connector_cleanup, > .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, > .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, > }; > @@ -76,9 +70,6 @@ int rcar_du_vga_connector_init(struct rcar_du_device *rcdu, > return ret; > > drm_connector_helper_add(connector, &connector_helper_funcs); > - ret = drm_connector_register(connector); > - if (ret < 0) > - return ret; > > connector->dpms = DRM_MODE_DPMS_OFF; > drm_object_property_set_value(&connector->base, > -- > Regards, > > Laurent Pinchart > > _______________________________________________ > dri-devel mailing list > dri-devel@lists.freedesktop.org > http://lists.freedesktop.org/mailman/listinfo/dri-devel
Hi Daniel, On Tuesday 20 October 2015 09:32:13 Daniel Vetter wrote: > On Tue, Oct 20, 2015 at 01:51:54AM +0300, Laurent Pinchart wrote: > > The drm driver .load() operation is prone to race conditions as it > > initializes the driver after registering the device nodes. Its usage is > > deprecated, inline it in the probe function and call drm_dev_alloc() and > > drm_dev_register() explicitly. > > > > For consistency inline the .unload() handler in the remove function as > > well. > > > > Signed-off-by: Laurent Pinchart > > <laurent.pinchart+renesas@ideasonboard.com> > > --- > > > > drivers/gpu/drm/rcar-du/rcar_du_drv.c | 184 +++++++++++++----------- > > drivers/gpu/drm/rcar-du/rcar_du_hdmicon.c | 11 +- > > drivers/gpu/drm/rcar-du/rcar_du_lvdscon.c | 11 +- > > drivers/gpu/drm/rcar-du/rcar_du_vgacon.c | 11 +- > > 4 files changed, 104 insertions(+), 113 deletions(-) > > > > diff --git a/drivers/gpu/drm/rcar-du/rcar_du_drv.c > > b/drivers/gpu/drm/rcar-du/rcar_du_drv.c index bebcc97db5e5..46d628752371 > > 100644 > > --- a/drivers/gpu/drm/rcar-du/rcar_du_drv.c > > +++ b/drivers/gpu/drm/rcar-du/rcar_du_drv.c [snip] > > -static int rcar_du_remove(struct platform_device *pdev) > > +static int rcar_du_probe(struct platform_device *pdev) > > { > > - struct rcar_du_device *rcdu = platform_get_drvdata(pdev); > > + struct device_node *np = pdev->dev.of_node; > > + struct rcar_du_device *rcdu; > > + struct drm_connector *connector; > > + struct drm_device *ddev; > > + struct resource *mem; > > + int ret; > > + > > + if (np == NULL) { > > + dev_err(&pdev->dev, "no device tree node\n"); > > + return -ENODEV; > > + } > > + > > + /* Allocate and initialize the DRM and R-Car device structures. */ > > + rcdu = devm_kzalloc(&pdev->dev, sizeof(*rcdu), GFP_KERNEL); > > + if (rcdu == NULL) > > + return -ENOMEM; > > + > > + init_waitqueue_head(&rcdu->commit.wait); > > > > - drm_put_dev(rcdu->ddev); > > + rcdu->dev = &pdev->dev; > > + rcdu->info = of_match_device(rcar_du_of_table, rcdu->dev)->data; > > + > > + ddev = drm_dev_alloc(&rcar_du_driver, &pdev->dev); > > + if (!ddev) > > + return -ENOMEM; > > + > > + rcdu->ddev = ddev; > > + ddev->dev_private = rcdu; > > + > > + platform_set_drvdata(pdev, rcdu); > > + > > + /* I/O resources */ > > + mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); > > + rcdu->mmio = devm_ioremap_resource(&pdev->dev, mem); > > + if (IS_ERR(rcdu->mmio)) { > > + ret = PTR_ERR(rcdu->mmio); > > + goto error; > > + } > > + > > + /* Initialize vertical blanking interrupts handling. Start with vblank > > + * disabled for all CRTCs. > > + */ > > + ret = drm_vblank_init(ddev, (1 << rcdu->info->num_crtcs) - 1); > > + if (ret < 0) { > > + dev_err(&pdev->dev, "failed to initialize vblank\n"); > > + goto error; > > + } > > + > > + /* DRM/KMS objects */ > > + ret = rcar_du_modeset_init(rcdu); > > + if (ret < 0) { > > + dev_err(&pdev->dev, "failed to initialize DRM/KMS (%d)\n", ret); > > + goto error; > > + } > > + > > + ddev->irq_enabled = 1; > > + > > + /* Register the DRM device with the core and the connectors with > > + * sysfs. > > + */ > > + ret = drm_dev_register(ddev, 0); > > + if (ret) > > + goto error; > > + > > + mutex_lock(&ddev->mode_config.mutex); > > + drm_for_each_connector(connector, ddev) { > > + ret = drm_connector_register(connector); > > + if (ret < 0) > > + break; > > + } > > + mutex_unlock(&ddev->mode_config.mutex); > > I'm wondereding whether we shouldn't just wrap this up in a helper somehow, > like drm_dev_modeset_register. How about drm_connector_plug_all() to match the existing drm_connector_unplug_all() ? > Only trouble is that we might be racing with adding MST connectors already, > and that's where I stopped thinking about it ;-) You'll have to brief me on the MST issue if you want my opinion on the matter :-) > Anyway that aside aside: > > Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch> Thanks. > > + > > + if (ret < 0) > > + goto error; > > + > > + DRM_INFO("Device %s probed\n", dev_name(&pdev->dev)); > > > > return 0; > > + > > +error: > > + rcar_du_remove(pdev); > > + > > + return ret; > > > > }
On Wed, Oct 21, 2015 at 06:16:08PM +0300, Laurent Pinchart wrote: > Hi Daniel, > > On Tuesday 20 October 2015 09:32:13 Daniel Vetter wrote: > > On Tue, Oct 20, 2015 at 01:51:54AM +0300, Laurent Pinchart wrote: > > > The drm driver .load() operation is prone to race conditions as it > > > initializes the driver after registering the device nodes. Its usage is > > > deprecated, inline it in the probe function and call drm_dev_alloc() and > > > drm_dev_register() explicitly. > > > > > > For consistency inline the .unload() handler in the remove function as > > > well. > > > > > > Signed-off-by: Laurent Pinchart > > > <laurent.pinchart+renesas@ideasonboard.com> > > > --- > > > > > > drivers/gpu/drm/rcar-du/rcar_du_drv.c | 184 +++++++++++++----------- > > > drivers/gpu/drm/rcar-du/rcar_du_hdmicon.c | 11 +- > > > drivers/gpu/drm/rcar-du/rcar_du_lvdscon.c | 11 +- > > > drivers/gpu/drm/rcar-du/rcar_du_vgacon.c | 11 +- > > > 4 files changed, 104 insertions(+), 113 deletions(-) > > > > > > diff --git a/drivers/gpu/drm/rcar-du/rcar_du_drv.c > > > b/drivers/gpu/drm/rcar-du/rcar_du_drv.c index bebcc97db5e5..46d628752371 > > > 100644 > > > --- a/drivers/gpu/drm/rcar-du/rcar_du_drv.c > > > +++ b/drivers/gpu/drm/rcar-du/rcar_du_drv.c > > [snip] > > > > -static int rcar_du_remove(struct platform_device *pdev) > > > +static int rcar_du_probe(struct platform_device *pdev) > > > { > > > - struct rcar_du_device *rcdu = platform_get_drvdata(pdev); > > > + struct device_node *np = pdev->dev.of_node; > > > + struct rcar_du_device *rcdu; > > > + struct drm_connector *connector; > > > + struct drm_device *ddev; > > > + struct resource *mem; > > > + int ret; > > > + > > > + if (np == NULL) { > > > + dev_err(&pdev->dev, "no device tree node\n"); > > > + return -ENODEV; > > > + } > > > + > > > + /* Allocate and initialize the DRM and R-Car device structures. */ > > > + rcdu = devm_kzalloc(&pdev->dev, sizeof(*rcdu), GFP_KERNEL); > > > + if (rcdu == NULL) > > > + return -ENOMEM; > > > + > > > + init_waitqueue_head(&rcdu->commit.wait); > > > > > > - drm_put_dev(rcdu->ddev); > > > + rcdu->dev = &pdev->dev; > > > + rcdu->info = of_match_device(rcar_du_of_table, rcdu->dev)->data; > > > + > > > + ddev = drm_dev_alloc(&rcar_du_driver, &pdev->dev); > > > + if (!ddev) > > > + return -ENOMEM; > > > + > > > + rcdu->ddev = ddev; > > > + ddev->dev_private = rcdu; > > > + > > > + platform_set_drvdata(pdev, rcdu); > > > + > > > + /* I/O resources */ > > > + mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); > > > + rcdu->mmio = devm_ioremap_resource(&pdev->dev, mem); > > > + if (IS_ERR(rcdu->mmio)) { > > > + ret = PTR_ERR(rcdu->mmio); > > > + goto error; > > > + } > > > + > > > + /* Initialize vertical blanking interrupts handling. Start with > vblank > > > + * disabled for all CRTCs. > > > + */ > > > + ret = drm_vblank_init(ddev, (1 << rcdu->info->num_crtcs) - 1); > > > + if (ret < 0) { > > > + dev_err(&pdev->dev, "failed to initialize vblank\n"); > > > + goto error; > > > + } > > > + > > > + /* DRM/KMS objects */ > > > + ret = rcar_du_modeset_init(rcdu); > > > + if (ret < 0) { > > > + dev_err(&pdev->dev, "failed to initialize DRM/KMS (%d)\n", ret); > > > + goto error; > > > + } > > > + > > > + ddev->irq_enabled = 1; > > > + > > > + /* Register the DRM device with the core and the connectors with > > > + * sysfs. > > > + */ > > > + ret = drm_dev_register(ddev, 0); > > > + if (ret) > > > + goto error; > > > + > > > + mutex_lock(&ddev->mode_config.mutex); > > > + drm_for_each_connector(connector, ddev) { > > > + ret = drm_connector_register(connector); > > > + if (ret < 0) > > > + break; > > > + } > > > + mutex_unlock(&ddev->mode_config.mutex); > > > > I'm wondereding whether we shouldn't just wrap this up in a helper somehow, > > like drm_dev_modeset_register. > > How about drm_connector_plug_all() to match the existing > drm_connector_unplug_all() ? plug/unplug has for me a different meaning wrt connectors. And because of the MST problem I'd just leave this along really. > > Only trouble is that we might be racing with adding MST connectors already, > > and that's where I stopped thinking about it ;-) > > You'll have to brief me on the MST issue if you want my opinion on the matter > :-) MST can hot-add connectors, and we can do that as soon as we process hotplug events. Which is generally towards the end of the init sequence, but decidedly before drm_dev_register(). So a function which walks all connectors (even when holding relevant locks) could try to double-register a connector added through MST hotplug, leading to slight unpleasantries. But since this is hard I didn't think up an idea for how to address this. Since there's also the question whether the hotplug uevent will fare well before the drm_dev_register() call ... -Daniel > > > Anyway that aside aside: > > > > Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch> > > Thanks. > > > > + > > > + if (ret < 0) > > > + goto error; > > > + > > > + DRM_INFO("Device %s probed\n", dev_name(&pdev->dev)); > > > > > > return 0; > > > + > > > +error: > > > + rcar_du_remove(pdev); > > > + > > > + return ret; > > > > > > } > > -- > Regards, > > Laurent Pinchart >
Hi Daniel, On Wednesday 21 October 2015 17:39:45 Daniel Vetter wrote: > On Wed, Oct 21, 2015 at 06:16:08PM +0300, Laurent Pinchart wrote: > > On Tuesday 20 October 2015 09:32:13 Daniel Vetter wrote: > >> On Tue, Oct 20, 2015 at 01:51:54AM +0300, Laurent Pinchart wrote: > >>> The drm driver .load() operation is prone to race conditions as it > >>> initializes the driver after registering the device nodes. Its usage > >>> is deprecated, inline it in the probe function and call > >>> drm_dev_alloc() and drm_dev_register() explicitly. > >>> > >>> For consistency inline the .unload() handler in the remove function as > >>> well. > >>> > >>> Signed-off-by: Laurent Pinchart > >>> <laurent.pinchart+renesas@ideasonboard.com> > >>> --- > >>> > >>> drivers/gpu/drm/rcar-du/rcar_du_drv.c | 184 +++++++++++---------- > >>> drivers/gpu/drm/rcar-du/rcar_du_hdmicon.c | 11 +- > >>> drivers/gpu/drm/rcar-du/rcar_du_lvdscon.c | 11 +- > >>> drivers/gpu/drm/rcar-du/rcar_du_vgacon.c | 11 +- > >>> 4 files changed, 104 insertions(+), 113 deletions(-) > >>> > >>> diff --git a/drivers/gpu/drm/rcar-du/rcar_du_drv.c > >>> b/drivers/gpu/drm/rcar-du/rcar_du_drv.c index > >>> bebcc97db5e5..46d628752371 > >>> 100644 > >>> --- a/drivers/gpu/drm/rcar-du/rcar_du_drv.c > >>> +++ b/drivers/gpu/drm/rcar-du/rcar_du_drv.c > > > > [snip] > > > >>> -static int rcar_du_remove(struct platform_device *pdev) > >>> +static int rcar_du_probe(struct platform_device *pdev) > >>> { > >>> - struct rcar_du_device *rcdu = platform_get_drvdata(pdev); > >>> + struct device_node *np = pdev->dev.of_node; > >>> + struct rcar_du_device *rcdu; > >>> + struct drm_connector *connector; > >>> + struct drm_device *ddev; > >>> + struct resource *mem; > >>> + int ret; > >>> + > >>> + if (np == NULL) { > >>> + dev_err(&pdev->dev, "no device tree node\n"); > >>> + return -ENODEV; > >>> + } > >>> + > >>> + /* Allocate and initialize the DRM and R-Car device structures. */ > >>> + rcdu = devm_kzalloc(&pdev->dev, sizeof(*rcdu), GFP_KERNEL); > >>> + if (rcdu == NULL) > >>> + return -ENOMEM; > >>> + > >>> + init_waitqueue_head(&rcdu->commit.wait); > >>> > >>> - drm_put_dev(rcdu->ddev); > >>> + rcdu->dev = &pdev->dev; > >>> + rcdu->info = of_match_device(rcar_du_of_table, rcdu->dev)->data; > >>> + > >>> + ddev = drm_dev_alloc(&rcar_du_driver, &pdev->dev); > >>> + if (!ddev) > >>> + return -ENOMEM; > >>> + > >>> + rcdu->ddev = ddev; > >>> + ddev->dev_private = rcdu; > >>> + > >>> + platform_set_drvdata(pdev, rcdu); > >>> + > >>> + /* I/O resources */ > >>> + mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); > >>> + rcdu->mmio = devm_ioremap_resource(&pdev->dev, mem); > >>> + if (IS_ERR(rcdu->mmio)) { > >>> + ret = PTR_ERR(rcdu->mmio); > >>> + goto error; > >>> + } > >>> + > >>> + /* Initialize vertical blanking interrupts handling. Start with > >>> vblank > >>> + * disabled for all CRTCs. > >>> + */ > >>> + ret = drm_vblank_init(ddev, (1 << rcdu->info->num_crtcs) - 1); > >>> + if (ret < 0) { > >>> + dev_err(&pdev->dev, "failed to initialize vblank\n"); > >>> + goto error; > >>> + } > >>> + > >>> + /* DRM/KMS objects */ > >>> + ret = rcar_du_modeset_init(rcdu); > >>> + if (ret < 0) { > >>> + dev_err(&pdev->dev, "failed to initialize DRM/KMS (%d)\n", ret); > >>> + goto error; > >>> + } > >>> + > >>> + ddev->irq_enabled = 1; > >>> + > >>> + /* Register the DRM device with the core and the connectors with > >>> + * sysfs. > >>> + */ > >>> + ret = drm_dev_register(ddev, 0); > >>> + if (ret) > >>> + goto error; > >>> + > >>> + mutex_lock(&ddev->mode_config.mutex); > >>> + drm_for_each_connector(connector, ddev) { > >>> + ret = drm_connector_register(connector); > >>> + if (ret < 0) > >>> + break; > >>> + } > >>> + mutex_unlock(&ddev->mode_config.mutex); > >> > >> I'm wondereding whether we shouldn't just wrap this up in a helper > >> somehow, like drm_dev_modeset_register. > > > > How about drm_connector_plug_all() to match the existing > > drm_connector_unplug_all() ? > > plug/unplug has for me a different meaning wrt connectors. And because of > the MST problem I'd just leave this along really. > > >> Only trouble is that we might be racing with adding MST connectors > >> already, and that's where I stopped thinking about it ;-) > > > > You'll have to brief me on the MST issue if you want my opinion on the > > matter :-) > > MST can hot-add connectors, and we can do that as soon as we process > hotplug events. Which is generally towards the end of the init sequence, > but decidedly before drm_dev_register(). > > So a function which walks all connectors (even when holding relevant > locks) could try to double-register a connector added through MST hotplug, > leading to slight unpleasantries. > > But since this is hard I didn't think up an idea for how to address this. > Since there's also the question whether the hotplug uevent will fare well > before the drm_dev_register() call ... We've more or less successfully avoided thinking about dynamic addition and removal of encoders and CRTCs so far, and support for dynamically added connectors is probably also not as generic as it could be. We won't be able to continue in this direction for much longer, so prepare yourself psychologically ;-) It's a bit ironic that all these needs for dynamic changes come mostly from the embedded world where everything was supposed to be static. > >> Anyway that aside aside: > >> > >> Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch> > > > > Thanks. I've just noticed that the driver can crash due to .set_busid being still set to drm_platform_set_busid. I'll send a v2 with that removed and an explicit call to drm_dev_set_unique added. You might want to watch for the same issue if you review similar changes in other drivers. > >>> + > >>> + if (ret < 0) > >>> + goto error; > >>> + > >>> + DRM_INFO("Device %s probed\n", dev_name(&pdev->dev)); > >>> return 0; > >>> + > >>> +error: > >>> + rcar_du_remove(pdev); > >>> + > >>> + return ret; > >>> }
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_drv.c b/drivers/gpu/drm/rcar-du/rcar_du_drv.c index bebcc97db5e5..46d628752371 100644 --- a/drivers/gpu/drm/rcar-du/rcar_du_drv.c +++ b/drivers/gpu/drm/rcar-du/rcar_du_drv.c @@ -119,82 +119,6 @@ MODULE_DEVICE_TABLE(of, rcar_du_of_table); * DRM operations */ -static int rcar_du_unload(struct drm_device *dev) -{ - struct rcar_du_device *rcdu = dev->dev_private; - - if (rcdu->fbdev) - drm_fbdev_cma_fini(rcdu->fbdev); - - drm_kms_helper_poll_fini(dev); - drm_mode_config_cleanup(dev); - drm_vblank_cleanup(dev); - - dev->irq_enabled = 0; - dev->dev_private = NULL; - - return 0; -} - -static int rcar_du_load(struct drm_device *dev, unsigned long flags) -{ - struct platform_device *pdev = dev->platformdev; - struct device_node *np = pdev->dev.of_node; - struct rcar_du_device *rcdu; - struct resource *mem; - int ret; - - if (np == NULL) { - dev_err(dev->dev, "no platform data\n"); - return -ENODEV; - } - - rcdu = devm_kzalloc(&pdev->dev, sizeof(*rcdu), GFP_KERNEL); - if (rcdu == NULL) { - dev_err(dev->dev, "failed to allocate private data\n"); - return -ENOMEM; - } - - init_waitqueue_head(&rcdu->commit.wait); - - rcdu->dev = &pdev->dev; - rcdu->info = of_match_device(rcar_du_of_table, rcdu->dev)->data; - rcdu->ddev = dev; - dev->dev_private = rcdu; - - /* I/O resources */ - mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); - rcdu->mmio = devm_ioremap_resource(&pdev->dev, mem); - if (IS_ERR(rcdu->mmio)) - return PTR_ERR(rcdu->mmio); - - /* Initialize vertical blanking interrupts handling. Start with vblank - * disabled for all CRTCs. - */ - ret = drm_vblank_init(dev, (1 << rcdu->info->num_crtcs) - 1); - if (ret < 0) { - dev_err(&pdev->dev, "failed to initialize vblank\n"); - goto done; - } - - /* DRM/KMS objects */ - ret = rcar_du_modeset_init(rcdu); - if (ret < 0) { - dev_err(&pdev->dev, "failed to initialize DRM/KMS (%d)\n", ret); - goto done; - } - - dev->irq_enabled = 1; - - platform_set_drvdata(pdev, rcdu); - -done: - if (ret) - rcar_du_unload(dev); - - return ret; -} - static void rcar_du_preclose(struct drm_device *dev, struct drm_file *file) { struct rcar_du_device *rcdu = dev->dev_private; @@ -244,8 +168,6 @@ static const struct file_operations rcar_du_fops = { static struct drm_driver rcar_du_driver = { .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_PRIME | DRIVER_ATOMIC, - .load = rcar_du_load, - .unload = rcar_du_unload, .preclose = rcar_du_preclose, .lastclose = rcar_du_lastclose, .set_busid = drm_platform_set_busid, @@ -308,18 +230,114 @@ static const struct dev_pm_ops rcar_du_pm_ops = { * Platform driver */ -static int rcar_du_probe(struct platform_device *pdev) +static int rcar_du_remove(struct platform_device *pdev) { - return drm_platform_init(&rcar_du_driver, pdev); + struct rcar_du_device *rcdu = platform_get_drvdata(pdev); + struct drm_device *ddev = rcdu->ddev; + + mutex_lock(&ddev->mode_config.mutex); + drm_connector_unplug_all(ddev); + mutex_unlock(&ddev->mode_config.mutex); + + drm_dev_unregister(ddev); + + if (rcdu->fbdev) + drm_fbdev_cma_fini(rcdu->fbdev); + + drm_kms_helper_poll_fini(ddev); + drm_mode_config_cleanup(ddev); + drm_vblank_cleanup(ddev); + + drm_dev_unref(ddev); + + return 0; } -static int rcar_du_remove(struct platform_device *pdev) +static int rcar_du_probe(struct platform_device *pdev) { - struct rcar_du_device *rcdu = platform_get_drvdata(pdev); + struct device_node *np = pdev->dev.of_node; + struct rcar_du_device *rcdu; + struct drm_connector *connector; + struct drm_device *ddev; + struct resource *mem; + int ret; + + if (np == NULL) { + dev_err(&pdev->dev, "no device tree node\n"); + return -ENODEV; + } + + /* Allocate and initialize the DRM and R-Car device structures. */ + rcdu = devm_kzalloc(&pdev->dev, sizeof(*rcdu), GFP_KERNEL); + if (rcdu == NULL) + return -ENOMEM; + + init_waitqueue_head(&rcdu->commit.wait); - drm_put_dev(rcdu->ddev); + rcdu->dev = &pdev->dev; + rcdu->info = of_match_device(rcar_du_of_table, rcdu->dev)->data; + + ddev = drm_dev_alloc(&rcar_du_driver, &pdev->dev); + if (!ddev) + return -ENOMEM; + + rcdu->ddev = ddev; + ddev->dev_private = rcdu; + + platform_set_drvdata(pdev, rcdu); + + /* I/O resources */ + mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); + rcdu->mmio = devm_ioremap_resource(&pdev->dev, mem); + if (IS_ERR(rcdu->mmio)) { + ret = PTR_ERR(rcdu->mmio); + goto error; + } + + /* Initialize vertical blanking interrupts handling. Start with vblank + * disabled for all CRTCs. + */ + ret = drm_vblank_init(ddev, (1 << rcdu->info->num_crtcs) - 1); + if (ret < 0) { + dev_err(&pdev->dev, "failed to initialize vblank\n"); + goto error; + } + + /* DRM/KMS objects */ + ret = rcar_du_modeset_init(rcdu); + if (ret < 0) { + dev_err(&pdev->dev, "failed to initialize DRM/KMS (%d)\n", ret); + goto error; + } + + ddev->irq_enabled = 1; + + /* Register the DRM device with the core and the connectors with + * sysfs. + */ + ret = drm_dev_register(ddev, 0); + if (ret) + goto error; + + mutex_lock(&ddev->mode_config.mutex); + drm_for_each_connector(connector, ddev) { + ret = drm_connector_register(connector); + if (ret < 0) + break; + } + mutex_unlock(&ddev->mode_config.mutex); + + if (ret < 0) + goto error; + + DRM_INFO("Device %s probed\n", dev_name(&pdev->dev)); return 0; + +error: + rcar_du_remove(pdev); + + return ret; } static struct platform_driver rcar_du_platform_driver = { diff --git a/drivers/gpu/drm/rcar-du/rcar_du_hdmicon.c b/drivers/gpu/drm/rcar-du/rcar_du_hdmicon.c index 96f2eb43713c..6038be93c58d 100644 --- a/drivers/gpu/drm/rcar-du/rcar_du_hdmicon.c +++ b/drivers/gpu/drm/rcar-du/rcar_du_hdmicon.c @@ -55,12 +55,6 @@ static const struct drm_connector_helper_funcs connector_helper_funcs = { .best_encoder = rcar_du_connector_best_encoder, }; -static void rcar_du_hdmi_connector_destroy(struct drm_connector *connector) -{ - drm_connector_unregister(connector); - drm_connector_cleanup(connector); -} - static enum drm_connector_status rcar_du_hdmi_connector_detect(struct drm_connector *connector, bool force) { @@ -79,7 +73,7 @@ static const struct drm_connector_funcs connector_funcs = { .reset = drm_atomic_helper_connector_reset, .detect = rcar_du_hdmi_connector_detect, .fill_modes = drm_helper_probe_single_connector_modes, - .destroy = rcar_du_hdmi_connector_destroy, + .destroy = drm_connector_cleanup, .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, }; @@ -108,9 +102,6 @@ int rcar_du_hdmi_connector_init(struct rcar_du_device *rcdu, return ret; drm_connector_helper_add(connector, &connector_helper_funcs); - ret = drm_connector_register(connector); - if (ret < 0) - return ret; connector->dpms = DRM_MODE_DPMS_OFF; drm_object_property_set_value(&connector->base, diff --git a/drivers/gpu/drm/rcar-du/rcar_du_lvdscon.c b/drivers/gpu/drm/rcar-du/rcar_du_lvdscon.c index 0c43032fc693..e905f5da7aaa 100644 --- a/drivers/gpu/drm/rcar-du/rcar_du_lvdscon.c +++ b/drivers/gpu/drm/rcar-du/rcar_du_lvdscon.c @@ -62,12 +62,6 @@ static const struct drm_connector_helper_funcs connector_helper_funcs = { .best_encoder = rcar_du_connector_best_encoder, }; -static void rcar_du_lvds_connector_destroy(struct drm_connector *connector) -{ - drm_connector_unregister(connector); - drm_connector_cleanup(connector); -} - static enum drm_connector_status rcar_du_lvds_connector_detect(struct drm_connector *connector, bool force) { @@ -79,7 +73,7 @@ static const struct drm_connector_funcs connector_funcs = { .reset = drm_atomic_helper_connector_reset, .detect = rcar_du_lvds_connector_detect, .fill_modes = drm_helper_probe_single_connector_modes, - .destroy = rcar_du_lvds_connector_destroy, + .destroy = drm_connector_cleanup, .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, }; @@ -117,9 +111,6 @@ int rcar_du_lvds_connector_init(struct rcar_du_device *rcdu, return ret; drm_connector_helper_add(connector, &connector_helper_funcs); - ret = drm_connector_register(connector); - if (ret < 0) - return ret; connector->dpms = DRM_MODE_DPMS_OFF; drm_object_property_set_value(&connector->base, diff --git a/drivers/gpu/drm/rcar-du/rcar_du_vgacon.c b/drivers/gpu/drm/rcar-du/rcar_du_vgacon.c index e0a5d8f93963..9d7e5c99caf6 100644 --- a/drivers/gpu/drm/rcar-du/rcar_du_vgacon.c +++ b/drivers/gpu/drm/rcar-du/rcar_du_vgacon.c @@ -31,12 +31,6 @@ static const struct drm_connector_helper_funcs connector_helper_funcs = { .best_encoder = rcar_du_connector_best_encoder, }; -static void rcar_du_vga_connector_destroy(struct drm_connector *connector) -{ - drm_connector_unregister(connector); - drm_connector_cleanup(connector); -} - static enum drm_connector_status rcar_du_vga_connector_detect(struct drm_connector *connector, bool force) { @@ -48,7 +42,7 @@ static const struct drm_connector_funcs connector_funcs = { .reset = drm_atomic_helper_connector_reset, .detect = rcar_du_vga_connector_detect, .fill_modes = drm_helper_probe_single_connector_modes, - .destroy = rcar_du_vga_connector_destroy, + .destroy = drm_connector_cleanup, .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, }; @@ -76,9 +70,6 @@ int rcar_du_vga_connector_init(struct rcar_du_device *rcdu, return ret; drm_connector_helper_add(connector, &connector_helper_funcs); - ret = drm_connector_register(connector); - if (ret < 0) - return ret; connector->dpms = DRM_MODE_DPMS_OFF; drm_object_property_set_value(&connector->base,
The drm driver .load() operation is prone to race conditions as it initializes the driver after registering the device nodes. Its usage is deprecated, inline it in the probe function and call drm_dev_alloc() and drm_dev_register() explicitly. For consistency inline the .unload() handler in the remove function as well. Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> --- drivers/gpu/drm/rcar-du/rcar_du_drv.c | 184 ++++++++++++++++-------------- drivers/gpu/drm/rcar-du/rcar_du_hdmicon.c | 11 +- drivers/gpu/drm/rcar-du/rcar_du_lvdscon.c | 11 +- drivers/gpu/drm/rcar-du/rcar_du_vgacon.c | 11 +- 4 files changed, 104 insertions(+), 113 deletions(-)