drm/i915: Do not unlock upon error in i915_gem_idle()

We never took the lock ourselves and all callers expect the struct_mutex
to be locked upon return (be it success or error), thereore dropping the
lock along the error paths looks to be a vestigial error from

commit db1b76ca6a79c774074ae87bee7afc0825a478f5
Author: Daniel Vetter <daniel.vetter@ffwll.ch>
Date:   Tue Jul 9 16:51:37 2013 +0200

    drm/i915: don't frob mm.suspended when not using ums

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 3 insertions, 6 deletions

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 96f65a15ffc9..96ad99ccf0ac 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -4232,16 +4232,13 @@ i915_gem_idle(struct drm_device *dev)
         drm_i915_private_t *dev_priv = dev->dev_private;
         int ret;
 
-        if (dev_priv->ums.mm_suspended) {
-                mutex_unlock(&dev->struct_mutex);
+        if (dev_priv->ums.mm_suspended)
                 return 0;
-        }
 
         ret = i915_gpu_idle(dev);
-        if (ret) {
-                mutex_unlock(&dev->struct_mutex);
+        if (ret)
                 return ret;
-        }
+
         i915_gem_retire_requests(dev);
 
         /* Under UMS, be paranoid and evict. */