drm/i915: fix unpaired i915 device mutex on entervt failure.

Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Eric Anholt <eric@anholt.net>

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 4642115902d61a419ed112b39c5680810cbb6d35..ee896d91c5bc9bba958e43d4bf3e0f8aa53debd5 100644 (file)
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -4087,8 +4087,10 @@ i915_gem_entervt_ioctl(struct drm_device *dev, void *data,
        dev_priv->mm.suspended = 0;
 
        ret = i915_gem_init_ringbuffer(dev);
-       if (ret != 0)
+       if (ret != 0) {
+               mutex_unlock(&dev->struct_mutex);
                return ret;
+       }
 
        spin_lock(&dev_priv->mm.active_list_lock);
        BUG_ON(!list_empty(&dev_priv->mm.active_list));