Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> writes:
> Reading a single value from the object, the locking only provides futile
> protection against userspace races. The locking is useless so remove it.
>
> Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Mika Kuoppala <mika.kuoppala@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/i915_gem.c | 17 ++++-------------
> 1 file changed, 4 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
> index 2b2b74dbb446..d071d0af2a6c 100644
> --- a/drivers/gpu/drm/i915/i915_gem.c
> +++ b/drivers/gpu/drm/i915/i915_gem.c
> @@ -3983,17 +3983,10 @@ int i915_gem_get_caching_ioctl(struct drm_device *dev, void *data,
> {
> struct drm_i915_gem_caching *args = data;
> struct drm_i915_gem_object *obj;
> - int ret;
> -
> - ret = i915_mutex_lock_interruptible(dev);
> - if (ret)
> - return ret;
>
> obj = to_intel_bo(drm_gem_object_lookup(dev, file, args->handle));
> - if (&obj->base == NULL) {
> - ret = -ENOENT;
> - goto unlock;
> - }
> + if (&obj->base == NULL)
> + return -ENOENT;
>
> switch (obj->cache_level) {
> case I915_CACHE_LLC:
> @@ -4010,10 +4003,8 @@ int i915_gem_get_caching_ioctl(struct drm_device *dev, void *data,
> break;
> }
>
> - drm_gem_object_unreference(&obj->base);
> -unlock:
> - mutex_unlock(&dev->struct_mutex);
> - return ret;
> + drm_gem_object_unreference_unlocked(&obj->base);
> + return 0;
> }
>
> int i915_gem_set_caching_ioctl(struct drm_device *dev, void *data,
> --
> 2.1.4
>
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