diff mbox

[v2,06/23] OMAP_VOUT: Remove manager->device references

Message ID 1346326845-16583-7-git-send-email-archit@ti.com (mailing list archive)
State New, archived
Headers show

Commit Message

archit taneja Aug. 30, 2012, 11:40 a.m. UTC 
With the introduction of output entities, managers will now connect to outputs.
Use the helper op for managers named get_device. This will abstract away the
information on how to get the device from an overlay manager.

Using the helper function will reduce the number of pointer dereferences a user
of OMAPDSS needs to do and reduce risk of a NULL dereference.

Cc: Vaibhav Hiremath <hvaibhav@ti.com>
Signed-off-by: Archit Taneja <archit@ti.com>
---
 drivers/media/video/omap/omap_vout.c |   81 ++++++++++++++++++++++++----------
 1 file changed, 57 insertions(+), 24 deletions(-)

Comments

Tomi Valkeinen Aug. 31, 2012, 12:11 p.m. UTC | #1 
On Thu, 2012-08-30 at 17:10 +0530, Archit Taneja wrote:
> With the introduction of output entities, managers will now connect to outputs.
> Use the helper op for managers named get_device. This will abstract away the
> information on how to get the device from an overlay manager.
> 
> Using the helper function will reduce the number of pointer dereferences a user
> of OMAPDSS needs to do and reduce risk of a NULL dereference.

Almost all the uses here seem to be getting the dssdev from an overlay.
Would it make sense to implement get_device for an ovl? That would
reduce all the ovl->manager ? ovl->manager->get_device(ovl->manager) :
NULL; code to ovl->get_device(ovl).

 Tomi
Archit Taneja Aug. 31, 2012, 12:34 p.m. UTC | #2 
On Friday 31 August 2012 05:41 PM, Tomi Valkeinen wrote:
> On Thu, 2012-08-30 at 17:10 +0530, Archit Taneja wrote:
>> With the introduction of output entities, managers will now connect to outputs.
>> Use the helper op for managers named get_device. This will abstract away the
>> information on how to get the device from an overlay manager.
>>
>> Using the helper function will reduce the number of pointer dereferences a user
>> of OMAPDSS needs to do and reduce risk of a NULL dereference.
>
> Almost all the uses here seem to be getting the dssdev from an overlay.
> Would it make sense to implement get_device for an ovl? That would
> reduce all the ovl->manager ? ovl->manager->get_device(ovl->manager) :
> NULL; code to ovl->get_device(ovl).

That make sense.

We would still need mgr->get_device() though, as in some places, dss and 
drm try to get the display from the manager.

Archit

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diff mbox

Patch

diff --git a/drivers/media/video/omap/omap_vout.c b/drivers/media/video/omap/omap_vout.c
index 88cf9d9..0ebf87e 100644
--- a/drivers/media/video/omap/omap_vout.c
+++ b/drivers/media/video/omap/omap_vout.c
@@ -454,11 +454,16 @@  static int omapvid_init(struct omap_vout_device *vout, u32 addr)
 
 	win = &vout->win;
 	for (i = 0; i < ovid->num_overlays; i++) {
+		struct omap_dss_device *dssdev;
+
 		ovl = ovid->overlays[i];
-		if (!ovl->manager || !ovl->manager->device)
+		dssdev = ovl->manager ?
+			ovl->manager->get_device(ovl->manager) : NULL;
+
+		if (!dssdev)
 			return -EINVAL;
 
-		timing = &ovl->manager->device->panel.timings;
+		timing = &dssdev->panel.timings;
 
 		outw = win->w.width;
 		outh = win->w.height;
@@ -515,8 +520,12 @@  static int omapvid_apply_changes(struct omap_vout_device *vout)
 	struct omapvideo_info *ovid = &vout->vid_info;
 
 	for (i = 0; i < ovid->num_overlays; i++) {
+		struct omap_dss_device *dssdev;
+
 		ovl = ovid->overlays[i];
-		if (!ovl->manager || !ovl->manager->device)
+		dssdev = ovl->manager ?
+			ovl->manager->get_device(ovl->manager) : NULL;
+		if (!dssdev)
 			return -EINVAL;
 		ovl->manager->apply(ovl->manager);
 	}
@@ -579,12 +588,15 @@  static void omap_vout_isr(void *arg, unsigned int irqstatus)
 
 	ovid = &vout->vid_info;
 	ovl = ovid->overlays[0];
-	/* get the display device attached to the overlay */
-	if (!ovl->manager || !ovl->manager->device)
-		return;
 
 	mgr_id = ovl->manager->id;
-	cur_display = ovl->manager->device;
+
+	/* get the display device attached to the overlay */
+	cur_display = ovl->manager ?
+		ovl->manager->get_device(ovl->manager) : NULL;
+
+	if (!cur_display)
+		return;
 
 	spin_lock(&vout->vbq_lock);
 	do_gettimeofday(&timevalue);
@@ -948,7 +960,10 @@  static int omap_vout_release(struct file *file)
 	/* Disable all the overlay managers connected with this interface */
 	for (i = 0; i < ovid->num_overlays; i++) {
 		struct omap_overlay *ovl = ovid->overlays[i];
-		if (ovl->manager && ovl->manager->device)
+		struct omap_dss_device *dssdev = ovl->manager ?
+			ovl->manager->get_device(ovl->manager) : NULL;
+
+		if (dssdev)
 			ovl->disable(ovl);
 	}
 	/* Turn off the pipeline */
@@ -1081,14 +1096,17 @@  static int vidioc_try_fmt_vid_out(struct file *file, void *fh,
 	struct omapvideo_info *ovid;
 	struct omap_video_timings *timing;
 	struct omap_vout_device *vout = fh;
+	struct omap_dss_device *dssdev;
 
 	ovid = &vout->vid_info;
 	ovl = ovid->overlays[0];
+	/* get the display device attached to the overlay */
+	dssdev = ovl->manager ? ovl->manager->get_device(ovl->manager) : NULL;
 
-	if (!ovl->manager || !ovl->manager->device)
+	if (!dssdev)
 		return -EINVAL;
-	/* get the display device attached to the overlay */
-	timing = &ovl->manager->device->panel.timings;
+
+	timing = &dssdev->panel.timings;
 
 	vout->fbuf.fmt.height = timing->y_res;
 	vout->fbuf.fmt.width = timing->x_res;
@@ -1105,6 +1123,7 @@  static int vidioc_s_fmt_vid_out(struct file *file, void *fh,
 	struct omapvideo_info *ovid;
 	struct omap_video_timings *timing;
 	struct omap_vout_device *vout = fh;
+	struct omap_dss_device *dssdev;
 
 	if (vout->streaming)
 		return -EBUSY;
@@ -1113,13 +1132,14 @@  static int vidioc_s_fmt_vid_out(struct file *file, void *fh,
 
 	ovid = &vout->vid_info;
 	ovl = ovid->overlays[0];
+	dssdev = ovl->manager ? ovl->manager->get_device(ovl->manager) : NULL;
 
 	/* get the display device attached to the overlay */
-	if (!ovl->manager || !ovl->manager->device) {
+	if (!dssdev) {
 		ret = -EINVAL;
 		goto s_fmt_vid_out_exit;
 	}
-	timing = &ovl->manager->device->panel.timings;
+	timing = &dssdev->panel.timings;
 
 	/* We dont support RGB24-packed mode if vrfb rotation
 	 * is enabled*/
@@ -1298,6 +1318,7 @@  static int vidioc_s_crop(struct file *file, void *fh, struct v4l2_crop *crop)
 	struct omapvideo_info *ovid;
 	struct omap_overlay *ovl;
 	struct omap_video_timings *timing;
+	struct omap_dss_device *dssdev;
 
 	if (vout->streaming)
 		return -EBUSY;
@@ -1305,13 +1326,15 @@  static int vidioc_s_crop(struct file *file, void *fh, struct v4l2_crop *crop)
 	mutex_lock(&vout->lock);
 	ovid = &vout->vid_info;
 	ovl = ovid->overlays[0];
+	/* get the display device attached to the overlay */
+	dssdev = ovl->manager ? ovl->manager->get_device(ovl->manager) : NULL;
 
-	if (!ovl->manager || !ovl->manager->device) {
+	if (!dssdev) {
 		ret = -EINVAL;
 		goto s_crop_err;
 	}
-	/* get the display device attached to the overlay */
-	timing = &ovl->manager->device->panel.timings;
+
+	timing = &dssdev->panel.timings;
 
 	if (is_rotation_90_or_270(vout)) {
 		vout->fbuf.fmt.height = timing->x_res;
@@ -1666,8 +1689,9 @@  static int vidioc_streamon(struct file *file, void *fh, enum v4l2_buf_type i)
 
 	for (j = 0; j < ovid->num_overlays; j++) {
 		struct omap_overlay *ovl = ovid->overlays[j];
+		struct omap_overlay_manager *mgr = ovl->manager;
 
-		if (ovl->manager && ovl->manager->device) {
+		if (mgr && mgr->get_device(mgr)) {
 			struct omap_overlay_info info;
 			ovl->get_overlay_info(ovl, &info);
 			info.paddr = addr;
@@ -1690,8 +1714,10 @@  static int vidioc_streamon(struct file *file, void *fh, enum v4l2_buf_type i)
 
 	for (j = 0; j < ovid->num_overlays; j++) {
 		struct omap_overlay *ovl = ovid->overlays[j];
+		struct omap_dss_device *dssdev = ovl->manager ?
+			ovl->manager->get_device(ovl->manager) : NULL;
 
-		if (ovl->manager && ovl->manager->device) {
+		if (dssdev) {
 			ret = ovl->enable(ovl);
 			if (ret)
 				goto streamon_err1;
@@ -1726,8 +1752,10 @@  static int vidioc_streamoff(struct file *file, void *fh, enum v4l2_buf_type i)
 
 	for (j = 0; j < ovid->num_overlays; j++) {
 		struct omap_overlay *ovl = ovid->overlays[j];
+		struct omap_dss_device *dssdev = ovl->manager ?
+			ovl->manager->get_device(ovl->manager) : NULL;
 
-		if (ovl->manager && ovl->manager->device)
+		if (dssdev)
 			ovl->disable(ovl);
 	}
 
@@ -1890,8 +1918,9 @@  static int __init omap_vout_setup_video_data(struct omap_vout_device *vout)
 	struct video_device *vfd;
 	struct v4l2_pix_format *pix;
 	struct v4l2_control *control;
+	struct omap_overlay *ovl = vout->vid_info.overlays[0];
 	struct omap_dss_device *display =
-		vout->vid_info.overlays[0]->manager->device;
+		ovl->manager->get_device(ovl->manager);
 
 	/* set the default pix */
 	pix = &vout->pix;
@@ -2205,8 +2234,10 @@  static int __init omap_vout_probe(struct platform_device *pdev)
 	 */
 	for (i = 1; i < vid_dev->num_overlays; i++) {
 		ovl = omap_dss_get_overlay(i);
-		if (ovl->manager && ovl->manager->device) {
-			def_display = ovl->manager->device;
+		dssdev = ovl->manager ? ovl->manager->get_device(ovl->manager) :
+				NULL;
+		if (dssdev) {
+			def_display = dssdev;
 		} else {
 			dev_warn(&pdev->dev, "cannot find display\n");
 			def_display = NULL;
@@ -2253,8 +2284,10 @@  probe_err1:
 	for (i = 1; i < vid_dev->num_overlays; i++) {
 		def_display = NULL;
 		ovl = omap_dss_get_overlay(i);
-		if (ovl->manager && ovl->manager->device)
-			def_display = ovl->manager->device;
+		dssdev = ovl->manager ? ovl->manager->get_device(ovl->manager) :
+				NULL;
+		if (dssdev)
+			def_display = dssdev;
 
 		if (def_display && def_display->driver)
 			def_display->driver->disable(def_display);