linux-kernel - Re: [PATCH v4 0/3] drm: Fix dma_resv deadlock at drm object pin time

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Date: Wed, 29 May 2024 09:32:16 +0200
From: Boris Brezillon <boris.brezillon@...labora.com>
To: Adrián Larumbe <adrian.larumbe@...labora.com>
Cc: Rob Herring <robh@...nel.org>, Steven Price <steven.price@....com>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, Maxime Ripard
 <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, David Airlie
 <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>, Sumit Semwal
 <sumit.semwal@...aro.org>, Christian König
 <christian.koenig@....com>, Dmitry Osipenko
 <dmitry.osipenko@...labora.com>, Zack Rusin <zack.rusin@...adcom.com>,
 kernel@...labora.com, dri-devel@...ts.freedesktop.org,
 linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
 linaro-mm-sig@...ts.linaro.org
Subject: Re: [PATCH v4 0/3] drm: Fix dma_resv deadlock at drm object pin
 time

On Thu, 23 May 2024 12:32:16 +0100
Adrián Larumbe <adrian.larumbe@...labora.com> wrote:

> This is v4 of https://lore.kernel.org/lkml/20240521181817.097af5e1@collabora.com/T/
> 
> The goal of this patch series is fixing a deadlock upon locking the dma reservation
> of a DRM gem object when pinning it, at a prime import operation.
> 
> Changelog:
> v3:
>  - Split driver fixes into separate commits for Panfrost and Lima
>  - Make drivers call drm_gem_shmem_pin_locked instead of drm_gem_shmem_object_pin
>  - Improved commit message for first patch to explain why dma resv locking in the 
>  pin callback is no longer necessary.
> v2:
>  - Removed comment explaining reason why an already-locked
> pin function replaced the locked variant inside Panfrost's
> object pin callback.
>  - Moved already-assigned attachment warning into generic
> already-locked gem object pin function
> 
> 
> Adrián Larumbe (3):
>   drm/panfrost: Fix dma_resv deadlock at drm object pin time
>   drm/lima: Fix dma_resv deadlock at drm object pin time
>   drm/gem-shmem: Add import attachment warning to locked pin function

Queued to drm-misc-fixes.

Thanks!

Boris