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

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 0274766428
 Author: Ville Syrjälä <ville.syrjala@linux.intel.com>
 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@linux.intel.com>
Cc: stable@vger.kernel.org
[danvet: Add cc: stable since the offending commit has that, too.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Ville Syrjälä 2014-01-07 16:15:36 +02:00 committed by Daniel Vetter
parent 0882dae983
commit 7ad228b11e
1 changed files with 2 additions and 2 deletions
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4
drivers/gpu/drm/i915/intel_display.c
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@ -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)