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

[Daniel Vetter]

On Fri, Apr 29, 2022 at 09:17:31PM +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>
> ---
> Daniel, please apply to the appropriate drm-misc branch to make sure
> this ends up in the same pullrequest as the offending commit.

Apologies on being behind on emails, I just came to the same conclusion.

Except there's one issue, the error path for sync_file_create is after a
successful call to drm_sched_entity_push_job(), so in that case we must
again _not_ call drm_sched_job_cleanup. So we need to change that goto
err_submit_job to goto err_submit_put and maybe add a comment about why.

Can you pls respin?

Thanks, Daniel

> ---
>  drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c b/drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c
> index 98bb5c9239de..bf2a400f59c9 100644
> --- a/drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c
> +++ b/drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c
> @@ -607,7 +607,8 @@ 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