linux-kernel - Re: [PATCH 1/6] drm/sched: Avoid memory leaks with cancel

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Message-ID: <dc5317a4-0adc-4371-871c-79b7d54614a6@igalia.com>
Date: Fri, 4 Jul 2025 09:18:47 -0300
From: Maíra Canal <mcanal@...lia.com>
To: Philipp Stanner <phasta@...nel.org>, Lyude Paul <lyude@...hat.com>,
 Danilo Krummrich <dakr@...nel.org>, David Airlie <airlied@...il.com>,
 Simona Vetter <simona@...ll.ch>, Matthew Brost <matthew.brost@...el.com>,
 Christian König <ckoenig.leichtzumerken@...il.com>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
 Sumit Semwal <sumit.semwal@...aro.org>,
 Tvrtko Ursulin <tvrtko.ursulin@...lia.com>,
 Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@....com>
Cc: dri-devel@...ts.freedesktop.org, nouveau@...ts.freedesktop.org,
 linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
 linaro-mm-sig@...ts.linaro.org
Subject: Re: [PATCH 1/6] drm/sched: Avoid memory leaks with cancel_job()
 callback

Hi Philipp,

On 01/07/25 10:21, Philipp Stanner wrote:
> Since its inception, the GPU scheduler can leak memory if the driver
> calls drm_sched_fini() while there are still jobs in flight.
> 
> The simplest way to solve this in a backwards compatible manner is by
> adding a new callback, drm_sched_backend_ops.cancel_job(), which
> instructs the driver to signal the hardware fence associated with the
> job. Afterwards, the scheduler can savely use the established free_job()

s/savely/safely

> callback for freeing the job.
> 
> Implement the new backend_ops callback cancel_job().
> 
> Suggested-by: Tvrtko Ursulin <tvrtko.ursulin@...lia.com>
> Link: https://lore.kernel.org/dri-devel/20250418113211.69956-1-tvrtko.ursulin@igalia.com/
> Signed-off-by: Philipp Stanner <phasta@...nel.org>

Reviewed-by: Maíra Canal <mcanal@...lia.com>

Best Regards,
- Maíra