Message ID | 20240501065650.2809530-3-adrian.larumbe@collabora.com (mailing list archive) |
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Wed, 1 May 2024 06:56:58 +0000 (UTC) From: =?utf-8?q?Adri=C3=A1n_Larumbe?= <adrian.larumbe@collabora.com> To: Qiang Yu <yuq825@gmail.com>, Maarten Lankhorst <maarten.lankhorst@linux.intel.com>, Maxime Ripard <mripard@kernel.org>, Thomas Zimmermann <tzimmermann@suse.de>, David Airlie <airlied@gmail.com>, Daniel Vetter <daniel@ffwll.ch>, Boris Brezillon <boris.brezillon@collabora.com>, Rob Herring <robh@kernel.org>, Steven Price <steven.price@arm.com>, Sumit Semwal <sumit.semwal@linaro.org>, Christian Koenig= <christian.koenig@amd.com>, Dmitry Osipenko <dmitry.osipenko@collabora.com>, Zack Rusin <zack.rusin@broadcom.com> Cc: kernel@collabora.com, Adrian Larumbe <adrian.larumbe@collabora.com>, dri-devel@lists.freedesktop.org, lima@lists.freedesktop.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, linaro-mm-sig@lists.linaro.org Subject: [PATCH v3 2/2] drm/gem-shmem: Add import attachment warning to locked pin function Date: Wed, 1 May 2024 07:56:00 +0100 Message-ID: <20240501065650.2809530-3-adrian.larumbe@collabora.com> X-Mailer: git-send-email 2.44.0 In-Reply-To: <20240501065650.2809530-1-adrian.larumbe@collabora.com> References: <20240501065650.2809530-1-adrian.larumbe@collabora.com> Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: <linux-media.vger.kernel.org> List-Subscribe: <mailto:linux-media+subscribe@vger.kernel.org> List-Unsubscribe: <mailto:linux-media+unsubscribe@vger.kernel.org> MIME-Version: 1.0 Content-Type: text/plain; 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Series |
drm: Fix dma_resv deadlock at drm object pin time
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Commit Message
Adrián Larumbe
May 1, 2024, 6:56 a.m. UTC
Commit ec144244a43f ("drm/gem-shmem: Acquire reservation lock in GEM
pin/unpin callbacks") moved locking DRM object's dma reservation to
drm_gem_shmem_object_pin, and made drm_gem_shmem_pin_locked public, so we
need to make sure the non-NULL check warning is also added to the latter.
Signed-off-by: Adrián Larumbe <adrian.larumbe@collabora.com>
---
drivers/gpu/drm/drm_gem_shmem_helper.c | 2 ++
1 file changed, 2 insertions(+)
Comments
On Wed, 1 May 2024 07:56:00 +0100 Adrián Larumbe <adrian.larumbe@collabora.com> wrote: > Commit ec144244a43f ("drm/gem-shmem: Acquire reservation lock in GEM > pin/unpin callbacks") moved locking DRM object's dma reservation to > drm_gem_shmem_object_pin, and made drm_gem_shmem_pin_locked public, so we > need to make sure the non-NULL check warning is also added to the latter. > > Signed-off-by: Adrián Larumbe <adrian.larumbe@collabora.com> > --- > drivers/gpu/drm/drm_gem_shmem_helper.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_gem_shmem_helper.c > index 177773bcdbfd..ad5d9f704e15 100644 > --- a/drivers/gpu/drm/drm_gem_shmem_helper.c > +++ b/drivers/gpu/drm/drm_gem_shmem_helper.c > @@ -233,6 +233,8 @@ int drm_gem_shmem_pin_locked(struct drm_gem_shmem_object *shmem) > > dma_resv_assert_held(shmem->base.resv); > > + drm_WARN_ON(shmem->base.dev, shmem->base.import_attach); If we add a WARN_ON() here, we can probably drop the one in drm_gem_shmem_pin(), and do the same for drm_gem_shmem_unpin[_locked]() to keep things consistent. > + > ret = drm_gem_shmem_get_pages(shmem); > > return ret;
diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_gem_shmem_helper.c index 177773bcdbfd..ad5d9f704e15 100644 --- a/drivers/gpu/drm/drm_gem_shmem_helper.c +++ b/drivers/gpu/drm/drm_gem_shmem_helper.c @@ -233,6 +233,8 @@ int drm_gem_shmem_pin_locked(struct drm_gem_shmem_object *shmem) dma_resv_assert_held(shmem->base.resv); + drm_WARN_ON(shmem->base.dev, shmem->base.import_attach); + ret = drm_gem_shmem_get_pages(shmem); return ret;