Patch "drm/i915: Don't grab crtc mutexes in intel_modeset_gem_init()" has been added to the 3.10-stable tree

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This is a note to let you know that I've just added the patch titled

    drm/i915: Don't grab crtc mutexes in intel_modeset_gem_init()

to the 3.10-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     drm-i915-don-t-grab-crtc-mutexes-in-intel_modeset_gem_init.patch
and it can be found in the queue-3.10 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From 7ad228b11ec26a820291c9f5a1168d6176580dc1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ville=20Syrj=C3=A4l=C3=A4?= <ville.syrjala@xxxxxxxxxxxxxxx>
Date: Tue, 7 Jan 2014 16:15:36 +0200
Subject: drm/i915: Don't grab crtc mutexes in intel_modeset_gem_init()
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>

commit 7ad228b11ec26a820291c9f5a1168d6176580dc1 upstream.

When the pipe A force quirk is applied the code will attempt to grab
a crtc mutex during intel_modeset_setup_hw_state(). If we're already
holding all crtc mutexes this will obviously deadlock every time.

So instead of using drm_modeset_lock_all() just grab the
mode_config.mutex. This is enough to avoid the unlocked mutex warnings
from certain lower level functions.

The regression was introduced in:

 commit 027476642811f8559cbe00ef6cc54db230e48a20
 Author: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
 Date:   Mon Dec 2 11:08:06 2013 +0200

    drm/i915: Take modeset locks around intel_modeset_setup_hw_state()

Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
[danvet: Add cc: stable since the offending commit has that, too.]
Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/gpu/drm/i915/intel_display.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -9456,9 +9456,9 @@ void intel_modeset_gem_init(struct drm_d
 
 	intel_setup_overlay(dev);
 
-	drm_modeset_lock_all(dev);
+	mutex_lock(&dev->mode_config.mutex);
 	intel_modeset_setup_hw_state(dev, false);
-	drm_modeset_unlock_all(dev);
+	mutex_unlock(&dev->mode_config.mutex);
 }
 
 void intel_modeset_cleanup(struct drm_device *dev)


Patches currently in stable-queue which might be from ville.syrjala@xxxxxxxxxxxxxxx are

queue-3.10/drm-i915-don-t-grab-crtc-mutexes-in-intel_modeset_gem_init.patch
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