releases/3.9.3/drm-don-t-check-modeset-locks-in-panic-handler.patch

From a9b054e8ab06504c2afa0e307ee78d3778993a1d Mon Sep 17 00:00:00 2001
From: Daniel Vetter <daniel.vetter@ffwll.ch>
Date: Thu, 2 May 2013 09:43:05 +0200
Subject: drm: don't check modeset locks in panic handler

From: Daniel Vetter <daniel.vetter@ffwll.ch>

commit a9b054e8ab06504c2afa0e307ee78d3778993a1d upstream.

Since we know that locking is broken in that case and it's more
important to not flood the dmesg with random gunk.

Reported-and-tested-by: Borislav Petkov <bp@suse.de>
References: http://lkml.kernel.org/r/20130502000206.GH15623@pd.tnic
Cc: Dave Airlie <airlied@gmail.com>
Cc: Borislav Petkov <bp@alien8.de>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/gpu/drm/drm_crtc.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -78,6 +78,10 @@ void drm_warn_on_modeset_not_all_locked(
 {
 	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));