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

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Date: Thu, 23 May 2024 12:32:16 +0100
From: Adrián Larumbe <adrian.larumbe@...labora.com>
To: Boris Brezillon <boris.brezillon@...labora.com>,
	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>
Cc: kernel@...labora.com,
	Adrián Larumbe <adrian.larumbe@...labora.com>,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org,
	linux-media@...r.kernel.org,
	linaro-mm-sig@...ts.linaro.org
Subject: [PATCH v4 0/3] drm: Fix dma_resv deadlock at drm object pin time

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

 drivers/gpu/drm/drm_gem_shmem_helper.c  | 2 ++
 drivers/gpu/drm/lima/lima_gem.c         | 2 +-
 drivers/gpu/drm/panfrost/panfrost_gem.c | 2 +-
 3 files changed, 4 insertions(+), 2 deletions(-)


base-commit: 7acacca1b157fcb258cfd781603425f73bc7370b
-- 
2.45.1