Chris Wilson b68d8379c2 dma-buf: Restart reservation_object_test_signaled_rcu() after writes ... In order to be completely generic, we have to double check the read seqlock after acquiring a reference to the fence. If the driver is allocating fences from a SLAB_DESTROY_BY_RCU, or similar freelist, then within an RCU grace period a fence may be freed and reallocated. The RCU read side critical section does not prevent this reallocation, instead we have to inspect the reservation's seqlock to double check if the fences have been reassigned as we were acquiring our reference. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Daniel Vetter <daniel.vetter@ffwll.ch> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Cc: Christian König <christian.koenig@amd.com> Cc: Alex Deucher <alexander.deucher@amd.com> Cc: Sumit Semwal <sumit.semwal@linaro.org> Cc: linux-media@vger.kernel.org Cc: dri-devel@lists.freedesktop.org Cc: linaro-mm-sig@lists.linaro.org Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org> Link: http://patchwork.freedesktop.org/patch/msgid/20160829070834.22296-9-chris@chris-wilson.co.uk		2016-10-12 20:00:02 +05:30
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dma-buf.c	dma-buf: Wait on the reservation object when sync'ing before CPU access	2016-08-16 12:31:35 +05:30
fence-array.c	dma-buf: fix kernel-doc warning and typos	2016-08-17 09:19:28 +05:30
fence.c	dma-buf/fence: make fence context 64 bit v2	2016-06-02 08:27:41 +02:00
Kconfig	dma-buf/sync_file: improve Kconfig description for Sync Files	2016-07-13 19:52:08 +05:30
Makefile	dma-buf/fence: add fence_array fences v6	2016-06-02 09:26:15 +02:00
reservation.c	dma-buf: Restart reservation_object_test_signaled_rcu() after writes	2016-10-12 20:00:02 +05:30
seqno-fence.c	dma-buf: Minor coding style fixes	2015-05-21 11:29:59 +05:30
sync_file.c	dma-buf/sync_file: free fences array in num_fences is 1	2016-09-22 04:06:16 -07:00