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drm: fix drm_mode_getconnector() locking imbalance regression 

Regression in commit 2caa80e72b
Author: Daniel Vetter <daniel.vetter@ffwll.ch>
Date:   Sun Feb 22 11:38:36 2015 +0100

    drm: Fix deadlock due to getconnector locking changes

If the drm_connector_find() call returns NULL, we should no longer
call drm_modeset_unlock() to avoid locking imbalance.

Signed-off-by: Tommi Rantala <tt.rantala@gmail.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Tommi Rantala 2015-04-03 10:45:29 +03:00 committed by Dave Airlie
parent f22e6e8471
commit 04bdf44178
1 changed files with 3 additions and 1 deletions
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4
drivers/gpu/drm/drm_crtc.c
View File

@ -2121,7 +2121,7 @@ int drm_mode_getconnector(struct drm_device *dev, void *data,
connector = drm_connector_find(dev, out_resp->connector_id);
if (!connector) {
ret = -ENOENT;
goto out;
goto out_unlock;
}
for (i = 0; i < DRM_CONNECTOR_MAX_ENCODER; i++)
@ -2201,6 +2201,8 @@ int drm_mode_getconnector(struct drm_device *dev, void *data,
out:
drm_modeset_unlock(&dev->mode_config.connection_mutex);
out_unlock:
mutex_unlock(&dev->mode_config.mutex);
return ret;