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[media] media: s3c-camif: fix deadlock on driver probe()

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Commit 0c426c472b ("[media] media: Always
keep a graph walk large enough around") changed
media_device_register_entity() function to take mdev->graph_mutex. This
causes deadlock in driver probe, which calls (indirectly) this function
with ->graph_mutex taken. This patch removes taking ->graph_mutex in
driver probe to avoid deadlock. Other drivers don't take ->graph_mutex
for entity registration, so this change should be safe.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Marek Szyprowski 2016-04-28 07:25:04 -03:00 committed by Mauro Carvalho Chehab
parent 243d4c0270
commit 9b15dfe054
1 changed files with 3 additions and 9 deletions
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12
drivers/media/platform/s3c-camif/camif-core.c
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@ -493,21 +493,17 @@ static int s3c_camif_probe(struct platform_device *pdev)
if (ret < 0)
goto err_sens;
mutex_lock(&camif->media_dev.graph_mutex);
ret = v4l2_device_register_subdev_nodes(&camif->v4l2_dev);
if (ret < 0)
goto err_unlock;
goto err_sens;
ret = camif_register_video_nodes(camif);
if (ret < 0)
goto err_unlock;
goto err_sens;
ret = camif_create_media_links(camif);
if (ret < 0)
goto err_unlock;
mutex_unlock(&camif->media_dev.graph_mutex);
goto err_sens;
ret = media_device_register(&camif->media_dev);
if (ret < 0)
@ -516,8 +512,6 @@ static int s3c_camif_probe(struct platform_device *pdev)
pm_runtime_put(dev);
return 0;
err_unlock:
mutex_unlock(&camif->media_dev.graph_mutex);
err_sens:
v4l2_device_unregister(&camif->v4l2_dev);
media_device_unregister(&camif->media_dev);