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Thu, 23 May 2024 12:13:22 +0000 (UTC) Date: Thu, 23 May 2024 14:13:21 +0200 From: Boris Brezillon To: =?UTF-8?B?QWRyacOhbg==?= Larumbe Cc: Rob Herring , Steven Price , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Daniel Vetter , Sumit Semwal , Christian =?UTF-8?B?S8O2bmln?= , Dmitry Osipenko , Zack Rusin , kernel@collabora.com, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, linaro-mm-sig@lists.linaro.org Subject: Re: [PATCH v4 2/3] drm/lima: Fix dma_resv deadlock at drm object pin time Message-ID: <20240523141321.52ea7224@collabora.com> In-Reply-To: <20240523113236.432585-3-adrian.larumbe@collabora.com> References: <20240523113236.432585-1-adrian.larumbe@collabora.com> <20240523113236.432585-3-adrian.larumbe@collabora.com> Organization: Collabora X-Mailer: Claws Mail 4.2.0 (GTK 3.24.41; x86_64-redhat-linux-gnu) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On Thu, 23 May 2024 12:32:18 +0100 Adri=C3=A1n Larumbe wrote: > Commit a78027847226 ("drm/gem: Acquire reservation lock in > drm_gem_{pin/unpin}()") moved locking the DRM object's dma reservation to > drm_gem_pin(), but Lima's pin callback kept calling drm_gem_shmem_pin, > which also tries to lock the same dma_resv, leading to a double lock > situation. >=20 > As was already done for Panfrost in the previous commit, fix it by > replacing drm_gem_shmem_pin() with its locked variant. >=20 > Cc: Thomas Zimmermann > Cc: Dmitry Osipenko > Cc: Boris Brezillon > Cc: Steven Price > Fixes: a78027847226 ("drm/gem: Acquire reservation lock in drm_gem_{pin/u= npin}()") > Signed-off-by: Adri=C3=A1n Larumbe Reviewed-by: Boris Brezillon > --- > drivers/gpu/drm/lima/lima_gem.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) >=20 > diff --git a/drivers/gpu/drm/lima/lima_gem.c b/drivers/gpu/drm/lima/lima_= gem.c > index 7ea244d876ca..9bb997dbb4b9 100644 > --- a/drivers/gpu/drm/lima/lima_gem.c > +++ b/drivers/gpu/drm/lima/lima_gem.c > @@ -185,7 +185,7 @@ static int lima_gem_pin(struct drm_gem_object *obj) > if (bo->heap_size) > return -EINVAL; > =20 > - return drm_gem_shmem_pin(&bo->base); > + return drm_gem_shmem_pin_locked(&bo->base); > } > =20 > static int lima_gem_vmap(struct drm_gem_object *obj, struct iosys_map *m= ap)