[PATCH v2] drm/etnaviv: avoid cleaning up sched_job when submit succeeded

[Daniel Vetter]

On Wed, May 04, 2022 at 11:02:29AM +0200, Lucas Stach wrote:
> While the labels may mislead the casual reader, the tail of the function
> etnaviv_ioctl_gem_submit is always executed, as a lot of the structures
> set up in this function need to be cleaned up regardless of whether the
> submit succeeded or failed.
> 
> An exception is the newly added drm_sched_job_cleanup, which must only
> be called when the submit failed before handing the job to the
> scheduler.
> 
> Fixes: b827c84f5e84 ("drm/etnaviv: Use scheduler dependency handling")
> Reported-by: Michael Walle <michael at walle.cc>
> Signed-off-by: Lucas Stach <l.stach at pengutronix.de>

Pushed to drm-misc-next, thanks for your patch to fix my bug :-)
-Daniel

> ---
>  drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c | 10 ++++++++--
>  1 file changed, 8 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c b/drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c
> index 98bb5c9239de..1ac916b24891 100644
> --- a/drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c
> +++ b/drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c
> @@ -598,7 +598,12 @@ int etnaviv_ioctl_gem_submit(struct drm_device *dev, void *data,
>  		sync_file = sync_file_create(submit->out_fence);
>  		if (!sync_file) {
>  			ret = -ENOMEM;
> -			goto err_submit_job;
> +			/*
> +			 * When this late error is hit, the submit has already
> +			 * been handed over to the scheduler. At this point
> +			 * the sched_job must not be cleaned up.
> +			 */
> +			goto err_submit_put;
>  		}
>  		fd_install(out_fence_fd, sync_file->file);
>  	}
> @@ -607,7 +612,8 @@ int etnaviv_ioctl_gem_submit(struct drm_device *dev, void *data,
>  	args->fence = submit->out_fence_id;
>  
>  err_submit_job:
> -	drm_sched_job_cleanup(&submit->sched_job);
> +	if (ret)
> +		drm_sched_job_cleanup(&submit->sched_job);
>  err_submit_put:
>  	etnaviv_submit_put(submit);
>  
> -- 
> 2.30.2
> 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch