Patch "drm/i915: get runtime PM reference around GEM set_caching IOCTL" has been added to the 3.14-stable tree

This is a note to let you know that I've just added the patch titled

drm/i915: get runtime PM reference around GEM set_caching IOCTL

to the 3.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
drm-i915-get-runtime-pm-reference-around-gem-set_caching-ioctl.patch
and it can be found in the queue-3.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Imre Deak <[email protected]>
Date: Wed, 4 Nov 2015 21:25:32 +0200
Subject: drm/i915: get runtime PM reference around GEM set_caching IOCTL

From: Imre Deak <[email protected]>

commit fd0fe6acf1dd88aabfbf383f7e4c16315387a7b7 upstream.

After Damien's D3 fix I started to get runtime suspend residency for the first time and that revealed a breakage on the set_caching IOCTL path that accesses the HW but doesn't take an RPM ref. Fix this up.

---
 drivers/gpu/drm/i915/i915_gem.c |    8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

@@ -3655,6 +3655,7 @@ unlock:
 int i915_gem_set_caching_ioctl(struct drm_device *dev, void *data,
 			       struct drm_file *file)
 {
+	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct drm_i915_gem_caching *args = data;
 	struct drm_i915_gem_object *obj;
 	enum i915_cache_level level;

@@ -3674,9 +3675,11 @@ int i915_gem_set_caching_ioctl(struct dr
 		return -EINVAL;
 	}
 
+	intel_runtime_pm_get(dev_priv);
+
 	ret = i915_mutex_lock_interruptible(dev);
 	if (ret)
-		return ret;
+		goto rpm_put;
 
 	obj = to_intel_bo(drm_gem_object_lookup(dev, file, args->handle));
 	if (&obj->base == NULL) {

@@ -3689,6 +3692,9 @@ int i915_gem_set_caching_ioctl(struct dr
 	drm_gem_object_unreference(&obj->base);
 unlock:
 	mutex_unlock(&dev->struct_mutex);
+rpm_put:
+	intel_runtime_pm_put(dev_priv);
+
 	return ret;
 }
 

Patches currently in stable-queue which might be from [email protected] are

queue-3.14/drm-i915-get-runtime-pm-reference-around-gem-set_caching-ioctl.patch