On 01/22, Yongzhi Liu wrote:
> [why]
> Unlock is needed on the error handling path to prevent dead lock.
>
> [how]
> Fix this by adding drm_gem_unlock_reservations on the error handling path.
>
> Signed-off-by: Yongzhi Liu <lyz_cs@xxxxxxxxxx>
> ---
> drivers/gpu/drm/v3d/v3d_gem.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/drivers/gpu/drm/v3d/v3d_gem.c b/drivers/gpu/drm/v3d/v3d_gem.c
> index c7ed2e1..0c989dc 100644
> --- a/drivers/gpu/drm/v3d/v3d_gem.c
> +++ b/drivers/gpu/drm/v3d/v3d_gem.c
> @@ -798,6 +798,8 @@ v3d_submit_cl_ioctl(struct drm_device *dev, void *data,
>
> if (!render->base.perfmon) {
> ret = -ENOENT;
> + drm_gem_unlock_reservations(last_job->bo,
> + last_job->bo_count, &acquire_ctx);
> goto fail;
Hi,
Nice catch!
As unlock is handle in fail_unreserve, I would suggest you to keep the
failures handling around there. In that case, the goto will target a
place between `fail_unreserve:` and `fail:`, i.e. calls
drm_gem_unlock_reservations (and the following cleanings) but don't call
mutex_unlock.
Thanks,
Melissa
> }
> }
> @@ -1027,6 +1029,8 @@ v3d_submit_csd_ioctl(struct drm_device *dev, void *data,
> args->perfmon_id);
> if (!job->base.perfmon) {
> ret = -ENOENT;
> + drm_gem_unlock_reservations(clean_job->bo, clean_job->bo_count,
> + &acquire_ctx);
> goto fail;
> }
> }
> --
> 2.7.4
>
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