| Message ID | 20230811073043.52808-2-ivan.orlov0322@gmail.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | [v2,1/3] fpga: bridge: make fpga_bridge_class a static const structure | expand |
On 8/11/23 11:30, Ivan Orlov wrote: > Now that the driver core allows for struct class to be in read-only > memory, move the fpga_mgr_class structure to be declared at build time > placing it into read-only memory, instead of having to be dynamically > allocated at boot time. > > Suggested-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> > Signed-off-by: Ivan Orlov <ivan.orlov0322@gmail.com> > --- > drivers/fpga/fpga-mgr.c | 25 ++++++++++++------------- > 1 file changed, 12 insertions(+), 13 deletions(-) > > diff --git a/drivers/fpga/fpga-mgr.c b/drivers/fpga/fpga-mgr.c > index eb583f86a0b9..06651389c592 100644 > --- a/drivers/fpga/fpga-mgr.c > +++ b/drivers/fpga/fpga-mgr.c > @@ -19,7 +19,7 @@ > #include <linux/highmem.h> > > static DEFINE_IDA(fpga_mgr_ida); > -static struct class *fpga_mgr_class; > +static const struct class fpga_mgr_class; > > struct fpga_mgr_devres { > struct fpga_manager *mgr; > @@ -693,7 +693,7 @@ static int fpga_mgr_dev_match(struct device *dev, const void *data) > */ > struct fpga_manager *fpga_mgr_get(struct device *dev) > { > - struct device *mgr_dev = class_find_device(fpga_mgr_class, NULL, dev, > + struct device *mgr_dev = class_find_device(&fpga_mgr_class, NULL, dev, > fpga_mgr_dev_match); > if (!mgr_dev) > return ERR_PTR(-ENODEV); > @@ -713,7 +713,7 @@ struct fpga_manager *of_fpga_mgr_get(struct device_node *node) > { > struct device *dev; > > - dev = class_find_device_by_of_node(fpga_mgr_class, node); > + dev = class_find_device_by_of_node(&fpga_mgr_class, node); > if (!dev) > return ERR_PTR(-ENODEV); > > @@ -809,7 +809,7 @@ fpga_mgr_register_full(struct device *parent, const struct fpga_manager_info *in > mgr->priv = info->priv; > mgr->compat_id = info->compat_id; > > - mgr->dev.class = fpga_mgr_class; > + mgr->dev.class = &fpga_mgr_class; > mgr->dev.groups = mops->groups; > mgr->dev.parent = parent; > mgr->dev.of_node = parent->of_node; > @@ -967,23 +967,22 @@ static void fpga_mgr_dev_release(struct device *dev) > kfree(mgr); > } > > +static const struct class fpga_mgr_class = { > + .name = "fpga_manager", > + .dev_groups = fpga_mgr_groups, > + .dev_release = fpga_mgr_dev_release, > +}; > + > static int __init fpga_mgr_class_init(void) > { > pr_info("FPGA manager framework\n"); > > - fpga_mgr_class = class_create("fpga_manager"); > - if (IS_ERR(fpga_mgr_class)) > - return PTR_ERR(fpga_mgr_class); > - > - fpga_mgr_class->dev_groups = fpga_mgr_groups; > - fpga_mgr_class->dev_release = fpga_mgr_dev_release; > - > - return 0; > + return class_register(&fpga_mgr_class); > } > > static void __exit fpga_mgr_class_exit(void) > { > - class_destroy(fpga_mgr_class); > + class_unregister(&fpga_mgr_class); > ida_destroy(&fpga_mgr_ida); > } > And I forgot the changelog here. V1 -> V2: - Add forward declaration of fpga_mgr_class - Move definition of fpga_mgr_class to more logical place
diff --git a/drivers/fpga/fpga-mgr.c b/drivers/fpga/fpga-mgr.c index eb583f86a0b9..06651389c592 100644 --- a/drivers/fpga/fpga-mgr.c +++ b/drivers/fpga/fpga-mgr.c @@ -19,7 +19,7 @@ #include <linux/highmem.h> static DEFINE_IDA(fpga_mgr_ida); -static struct class *fpga_mgr_class; +static const struct class fpga_mgr_class; struct fpga_mgr_devres { struct fpga_manager *mgr; @@ -693,7 +693,7 @@ static int fpga_mgr_dev_match(struct device *dev, const void *data) */ struct fpga_manager *fpga_mgr_get(struct device *dev) { - struct device *mgr_dev = class_find_device(fpga_mgr_class, NULL, dev, + struct device *mgr_dev = class_find_device(&fpga_mgr_class, NULL, dev, fpga_mgr_dev_match); if (!mgr_dev) return ERR_PTR(-ENODEV); @@ -713,7 +713,7 @@ struct fpga_manager *of_fpga_mgr_get(struct device_node *node) { struct device *dev; - dev = class_find_device_by_of_node(fpga_mgr_class, node); + dev = class_find_device_by_of_node(&fpga_mgr_class, node); if (!dev) return ERR_PTR(-ENODEV); @@ -809,7 +809,7 @@ fpga_mgr_register_full(struct device *parent, const struct fpga_manager_info *in mgr->priv = info->priv; mgr->compat_id = info->compat_id; - mgr->dev.class = fpga_mgr_class; + mgr->dev.class = &fpga_mgr_class; mgr->dev.groups = mops->groups; mgr->dev.parent = parent; mgr->dev.of_node = parent->of_node; @@ -967,23 +967,22 @@ static void fpga_mgr_dev_release(struct device *dev) kfree(mgr); } +static const struct class fpga_mgr_class = { + .name = "fpga_manager", + .dev_groups = fpga_mgr_groups, + .dev_release = fpga_mgr_dev_release, +}; + static int __init fpga_mgr_class_init(void) { pr_info("FPGA manager framework\n"); - fpga_mgr_class = class_create("fpga_manager"); - if (IS_ERR(fpga_mgr_class)) - return PTR_ERR(fpga_mgr_class); - - fpga_mgr_class->dev_groups = fpga_mgr_groups; - fpga_mgr_class->dev_release = fpga_mgr_dev_release; - - return 0; + return class_register(&fpga_mgr_class); } static void __exit fpga_mgr_class_exit(void) { - class_destroy(fpga_mgr_class); + class_unregister(&fpga_mgr_class); ida_destroy(&fpga_mgr_ida); }
Now that the driver core allows for struct class to be in read-only memory, move the fpga_mgr_class structure to be declared at build time placing it into read-only memory, instead of having to be dynamically allocated at boot time. Suggested-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Ivan Orlov <ivan.orlov0322@gmail.com> --- drivers/fpga/fpga-mgr.c | 25 ++++++++++++------------- 1 file changed, 12 insertions(+), 13 deletions(-)