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drm: delete unconsumed pending event list in drm_events_release 

When there are unconsumed pending events, the events are
destroyed by calling destroy callback, but the events list
are remained, because there is no list_del().

It is possible that the page flip request is handled after
drm_events_release() is called and before drm_fb_release().
In this case a drm_pending_event is remained not freed.
So exynos driver checks again to remove it in its post
close routine. But the file_priv->event_list contains
undeleted ones, this can make oops for accessing invalid
memory.

Signed-off-by: YoungJun Cho <yj44.cho@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
YoungJun Cho 2013-10-29 20:30:26 +09:00 committed by Dave Airlie
parent 06c5bf8cc5
commit 1dda680547
1 changed files with 3 additions and 1 deletions
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4
drivers/gpu/drm/drm_fops.c
View File

@ -378,8 +378,10 @@ static void drm_events_release(struct drm_file *file_priv)
}
/* Remove unconsumed events */
list_for_each_entry_safe(e, et, &file_priv->event_list, link)
list_for_each_entry_safe(e, et, &file_priv->event_list, link) {
list_del(&e->link);
e->destroy(e);
}
spin_unlock_irqrestore(&dev->event_lock, flags);
}