Hi Chris,
On 11 August 2016 at 20:16, Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> wrote:
> 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@xxxxxxxxxxxxxxxxxx>
> Cc: Rob Clark <robdclark@xxxxxxxxx>
> ---
> 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;
Am sure this must be a typo - 0 instead of 9?
> + else if (ret < 0)
> + return ret;
>
> /* TODO cache maintenance */
>
> --
> 2.8.1
>
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