drm: don't check modeset locks in panic handler
Since we know that locking is broken in that case and it's more
important to not flood the dmesg with random gunk.
Cc: Dave Airlie <airlied@gmail.com>
Cc: Borislav Petkov <bp@alien8.de>
References: http://lkml.kernel.org/r/20130502000206.GH15623@pd.tnic
Cc: stable@vger.kernel.org
Reported-and-tested-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index 792c3e3..3be0802 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -78,6 +78,10 @@
{
struct drm_crtc *crtc;
+ /* Locking is currently fubar in the panic handler. */
+ if (oops_in_progress)
+ return;
+
list_for_each_entry(crtc, &dev->mode_config.crtc_list, head)
WARN_ON(!mutex_is_locked(&crtc->mutex));