From: Chris Wilson Date: Mon, 29 Aug 2016 07:08:26 +0000 (+0100) Subject: drm/msm: Remove call to reservation_object_test_signaled_rcu before wait X-Git-Tag: v4.9.8~1110^2~22^2~8 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=f755e227dc0ad9f2b58937db489b9a6f6c7b76d9;p=platform%2Fkernel%2Flinux-rpi3.git drm/msm: Remove call to reservation_object_test_signaled_rcu before wait Since fence_wait_timeout_reservation_object_wait_timeout_rcu() with a timeout of 0 becomes reservation_object_test_signaled_rcu(), we do not need to handle such conversion in the caller. The only challenge are those callers that wish to differentiate the error code between the nonblocking busy check and potentially blocking wait. v2: 9 is only 0 in German. Signed-off-by: Chris Wilson Cc: Rob Clark Signed-off-by: Rob Clark --- diff --git a/drivers/gpu/drm/msm/msm_gem.c b/drivers/gpu/drm/msm/msm_gem.c index 6cd4af4..0a9b558 100644 --- a/drivers/gpu/drm/msm/msm_gem.c +++ b/drivers/gpu/drm/msm/msm_gem.c @@ -584,18 +584,16 @@ int msm_gem_cpu_prep(struct drm_gem_object *obj, uint32_t op, ktime_t *timeout) { struct msm_gem_object *msm_obj = to_msm_bo(obj); bool write = !!(op & MSM_PREP_WRITE); - - if (op & MSM_PREP_NOSYNC) { - if (!reservation_object_test_signaled_rcu(msm_obj->resv, write)) - return -EBUSY; - } else { - int ret; - - ret = reservation_object_wait_timeout_rcu(msm_obj->resv, write, - true, timeout_to_jiffies(timeout)); - if (ret <= 0) - return ret == 0 ? -ETIMEDOUT : ret; - } + unsigned long remain = + op & MSM_PREP_NOSYNC ? 0 : timeout_to_jiffies(timeout); + long ret; + + ret = reservation_object_wait_timeout_rcu(msm_obj->resv, write, + true, remain); + if (ret == 0) + return remain == 0 ? -EBUSY : -ETIMEDOUT; + else if (ret < 0) + return ret; /* TODO cache maintenance */