We only need to take the struct_mutex if the object is pinned to the
display engine and so requires checking for clflush. (The race with
userspace pinning the object to a framebuffer is irrelevant.)
v2: Use access once for compiler hints (or not as it is a bitfield)
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
---
drivers/gpu/drm/i915/i915_gem.c | 29 ++++++++++++++++-------------
1 file changed, 16 insertions(+), 13 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 95d4d2460f6a..f87e558a7233 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -1282,25 +1282,28 @@ i915_gem_sw_finish_ioctl(struct drm_device *dev, void *data,
{
struct drm_i915_gem_sw_finish *args = data;
struct drm_i915_gem_object *obj;
- int ret = 0;
-
- ret = i915_mutex_lock_interruptible(dev);
- if (ret)
- return ret;
+ int 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;
/* Pinned buffers may be scanout, so flush the cache */
- if (obj->pin_display)
+ if (obj->pin_display) {
+ ret = i915_mutex_lock_interruptible(dev);
+ if (ret)
+ goto unref;
+
i915_gem_object_flush_cpu_write_domain(obj);
- drm_gem_object_unreference(&obj->base);
-unlock:
- mutex_unlock(&dev->struct_mutex);
+ drm_gem_object_unreference(&obj->base);
+ mutex_unlock(&dev->struct_mutex);
+ } else {
+ ret = 0;
+unref:
+ drm_gem_object_unreference_unlocked(&obj->base);
+ }
+
return ret;
}
--
2.7.0.rc3
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