From 5e6a94713be051c491cd47c85263661af07b629c Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Fri, 6 Dec 2019 16:04:26 +0000 Subject: drm/i915: Check for error before calling cmpxchg() Only do the locked compare of the existing fence->error if we actually need to set an error. As we tend to call i915_sw_fence_set_error_once() unconditionally, it saves on typing to put the common has-error check into the inline. Signed-off-by: Chris Wilson Reviewed-by: Matthew Auld Link: https://patchwork.freedesktop.org/patch/msgid/20191206160428.1503343-1-chris@chris-wilson.co.uk --- drivers/gpu/drm/i915/i915_sw_fence.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'drivers/gpu/drm/i915/i915_sw_fence.h') diff --git a/drivers/gpu/drm/i915/i915_sw_fence.h b/drivers/gpu/drm/i915/i915_sw_fence.h index 1e90d9a51bd2..19e806ce43bc 100644 --- a/drivers/gpu/drm/i915/i915_sw_fence.h +++ b/drivers/gpu/drm/i915/i915_sw_fence.h @@ -112,7 +112,8 @@ static inline void i915_sw_fence_wait(struct i915_sw_fence *fence) static inline void i915_sw_fence_set_error_once(struct i915_sw_fence *fence, int error) { - cmpxchg(&fence->error, 0, error); + if (unlikely(error)) + cmpxchg(&fence->error, 0, error); } #endif /* _I915_SW_FENCE_H_ */ -- cgit v1.2.3-59-g8ed1b