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 3.12-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-3.12 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()
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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
@@ -10592,9 +10592,9 @@ 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-3.12/drm-i915-don-t-grab-crtc-mutexes-in-intel_modeset_gem_init.patch
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