linux-kernel - [ 052/102] drm: dont check modeset locks in panic handler

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Date:	Fri, 17 May 2013 14:36:07 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Dave Airlie <airlied@...il.com>,
	Borislav Petkov <bp@...en8.de>,
	Daniel Vetter <daniel.vetter@...ll.ch>
Subject: [ 052/102] drm: dont check modeset locks in panic handler

3.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Daniel Vetter <daniel.vetter@...ll.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@...e.de>
References: http://lkml.kernel.org/r/20130502000206.GH15623@pd.tnic
Cc: Dave Airlie <airlied@...il.com>
Cc: Borislav Petkov <bp@...en8.de>
Signed-off-by: Daniel Vetter <daniel.vetter@...ll.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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));
 


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