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

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.

Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Cc: stable@vger.kernel.org
Link: http://patchwork.freedesktop.org/patch/msgid/1446665132-22491-1-git-send-email-imre.deak@intel.com
Signed-off-by: Jani Nikula <jani.nikula@intel.com>

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 5cf4a1998273c3cfcc494c83210c0bc572f35c2e..91bb1fc27420f5a58f9fc2ca962a4b452f9cb7e6 100644 (file)
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -3809,6 +3809,7 @@ int i915_gem_get_caching_ioctl(struct drm_device *dev, void *data,
 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;
@@ -3837,9 +3838,11 @@ int i915_gem_set_caching_ioctl(struct drm_device *dev, void *data,
                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) {
@@ -3852,6 +3855,9 @@ int i915_gem_set_caching_ioctl(struct drm_device *dev, void *data,
        drm_gem_object_unreference(&obj->base);
 unlock:
        mutex_unlock(&dev->struct_mutex);
+rpm_put:
+       intel_runtime_pm_put(dev_priv);
+
        return ret;
 }