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Single fix for v4.18: 

- Fix possible race conditions while unplugging DRM device.
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Merge tag 'drm-misc-next-fixes-2018-06-15' of git://anongit.freedesktop.org/drm/drm-misc into drm-fixes

Single fix for v4.18:
- Fix possible race conditions while unplugging DRM device.

Signed-off-by: Dave Airlie <airlied@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1fd8b7d1-e60a-0105-dfb5-d36f99ea0239@linux.intel.com
This commit is contained in:
Dave Airlie 2018-06-20 16:57:41 +10:00
parent 845876a086 069035c5db
commit 4216c1b9af
1 changed files with 7 additions and 7 deletions
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14
drivers/gpu/drm/drm_drv.c
View File

@ -369,13 +369,6 @@ EXPORT_SYMBOL(drm_dev_exit);
*/
void drm_dev_unplug(struct drm_device *dev)
{
drm_dev_unregister(dev);
mutex_lock(&drm_global_mutex);
if (dev->open_count == 0)
drm_dev_put(dev);
mutex_unlock(&drm_global_mutex);
/*
* After synchronizing any critical read section is guaranteed to see
* the new value of ->unplugged, and any critical section which might
@ -384,6 +377,13 @@ void drm_dev_unplug(struct drm_device *dev)
*/
dev->unplugged = true;
synchronize_srcu(&drm_unplug_srcu);
drm_dev_unregister(dev);
mutex_lock(&drm_global_mutex);
if (dev->open_count == 0)
drm_dev_put(dev);
mutex_unlock(&drm_global_mutex);
}
EXPORT_SYMBOL(drm_dev_unplug);