The patch below does not apply to the 3.12-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>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: [PATCH] drm/i915: Don't grab crtc mutexes in intel_modeset_gem_init()
MIME-Version: 1.0
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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>
Cc: stable@xxxxxxxxxxxxxxx
[danvet: Add cc: stable since the offending commit has that, too.]
Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 769b864465a9..2bde35d34eb9 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -11053,10 +11053,10 @@ void intel_modeset_gem_init(struct drm_device *dev)
intel_setup_overlay(dev);
- drm_modeset_lock_all(dev);
+ mutex_lock(&dev->mode_config.mutex);
drm_mode_config_reset(dev);
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)
--
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