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drm: Fix locking gotcha in page_flip ioctl 

We want to lock the primary plane, not the cursor (which might be
optional). Real bad case of copy-paste fail, unfortunately our CI
didn't catch that because i915 does have a cursor plane.

Reported-by: Eric Anholt <eric@anholt.net>
Fixes: 29dc0d1de1 ("drm: Roll out acquire context for the page_flip ioctl")
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170330204831.8225-1-daniel.vetter@ffwll.ch
Tested-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
This commit is contained in:
Daniel Vetter 2017-03-30 22:48:31 +02:00 committed by Eric Anholt
parent bcd2ba02a4
commit 9739e74646
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/drm_plane.c
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@ -872,7 +872,7 @@ int drm_mode_page_flip_ioctl(struct drm_device *dev,
ret = drm_modeset_lock(&crtc->mutex, &ctx);
if (ret)
goto out;
ret = drm_modeset_lock(&crtc->cursor->mutex, &ctx);
ret = drm_modeset_lock(&crtc->primary->mutex, &ctx);
if (ret)
goto out;