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qHFMWTZwYY/Tfgh8gHB76fRY865fvZKEzO+vWN7CyiJASaZQX1ZNvVnULB3aGRoXYEg9DMv987mygJ/3Z3usMaps3EJ8vPlIZuWhPISz99M6XuCAS++XgyKuhDT9D87OzkM/7hCprqP8eshiLCU/3t/R/9Q7Se1CE27qhPYX58lxG0pwmtotJ4jZh3WjNlsbcEIjrAIl3FOTnxH8Cg9tyrjaEXQB0bLKKLDmeVuk5k9f7paw0QjClsJw0kMx/H62m0HerlHW7HMPGndxSO8W5XNVtEPlA5xuXM7LXgpQw8GmzzXYPsvdjT4Ky9epULNWivfu25J+Vl6WST6B9YDgxSy5o9raJRxwNiScF X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Am 15.02.23 um 17:13 schrieb Thomas Hellström: > The LRU mechanism may look up a resource in the process of being removed > from an object. The locking rules here are a bit unclear but it looks > currently like res->bo assignment is protected by the LRU lock, whereas > bo->resource is protected by the object lock, while *clearing* of > bo->resource is also protected by the LRU lock. This means that if > we check that bo->resource points to the LRU resource under the LRU > lock we should be safe. > So perform that check before deciding to swap out a bo. That avoids > dereferencing a NULL bo->resource in ttm_bo_swapout(). > > Fixes: 6a9b02899402 ("drm/ttm: move the LRU into resource handling v4") > Cc: Christian König > Cc: Daniel Vetter > Cc: Christian Koenig > Cc: Huang Rui > Cc: Alex Deucher > Cc: Felix Kuehling > Cc: Philip Yang > Cc: Qiang Yu > Cc: Matthew Auld > Cc: Nirmoy Das > Cc: Tvrtko Ursulin > Cc: "Thomas Hellström" > Cc: Anshuman Gupta > Cc: Ramalingam C > Cc: Arunpravin Paneer Selvam > Cc: dri-devel@lists.freedesktop.org > Signed-off-by: Thomas Hellström Reviewed-by: Christian König > --- > drivers/gpu/drm/ttm/ttm_device.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/ttm/ttm_device.c b/drivers/gpu/drm/ttm/ttm_device.c > index c7a1862f322a..ae2f19dc9f81 100644 > --- a/drivers/gpu/drm/ttm/ttm_device.c > +++ b/drivers/gpu/drm/ttm/ttm_device.c > @@ -158,7 +158,7 @@ int ttm_device_swapout(struct ttm_device *bdev, struct ttm_operation_ctx *ctx, > struct ttm_buffer_object *bo = res->bo; > uint32_t num_pages; > > - if (!bo) > + if (!bo || bo->resource != res) > continue; > > num_pages = PFN_UP(bo->base.size);