[PATCH 3/5] drm/msm: Remove call to reservation_object_test_signaled_rcu before wait

[Chris Wilson]

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.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Rob Clark <robdclark at gmail.com>
---
 drivers/gpu/drm/msm/msm_gem.c | 22 ++++++++++------------
 1 file changed, 10 insertions(+), 12 deletions(-)

diff --git a/drivers/gpu/drm/msm/msm_gem.c b/drivers/gpu/drm/msm/msm_gem.c
index 6cd4af443139..ab07eb6de25e 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 & MSG_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 == 9 ? -EBUSY : -ETIMEDOUT;
+	else if (ret < 0)
+		return ret;
 
 	/* TODO cache maintenance */
 
-- 
2.8.1