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linux/drivers/dma-buf
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Chris Wilson b016cd6ed4 dma-buf: Restore seqlock around dma_resv updates 
This reverts
67c97fb79a ("dma-buf: add reservation_object_fences helper")
dd7a7d1ff2 ("drm/i915: use new reservation_object_fences helper")
0e1d8083bd ("dma-buf: further relax reservation_object_add_shared_fence")
5d344f58da ("dma-buf: nuke reservation_object seq number")

The scenario that defeats simply grabbing a set of shared/exclusive
fences and using them blissfully under RCU is that any of those fences
may be reallocated by a SLAB_TYPESAFE_BY_RCU fence slab cache. In this
scenario, while keeping the rcu_read_lock we need to establish that no
fence was changed in the dma_resv after a read (or full) memory barrier.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Acked-by: Christian König <christian.koenig@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190814182401.25009-1-chris@chris-wilson.co.uk
2019-08-16 12:40:58 +01:00
..
dma-buf.c dma-buf: Restore seqlock around dma_resv updates 2019-08-16 12:40:58 +01:00
dma-fence-array.c dma-fence: Propagate errors to dma-fence-array container 2019-08-12 08:25:52 +01:00
dma-fence-chain.c dma-buf: fix stack corruption in dma_fence_chain_release 2019-08-05 17:32:33 +02:00
dma-fence.c dma-buf: rename reservation_object to dma_resv 2019-08-13 09:09:30 +02:00
dma-resv.c dma-buf: Restore seqlock around dma_resv updates 2019-08-16 12:40:58 +01:00
Kconfig docs: driver-api: add a series of orphaned documents 2019-07-15 11:03:02 -03:00
Makefile dma-buf: rename reservation_object to dma_resv 2019-08-13 09:09:30 +02:00
seqno-fence.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 174 2019-05-30 11:26:41 -07:00
sw_sync.c dma-buf/sw_sync: Synchronize signal vs syncpt free 2019-08-13 07:57:51 +01:00
sync_debug.c Linux 5.2-rc5 2019-06-19 12:07:29 +02:00
sync_debug.h dma-buf: Remove unused sync_dump() 2019-04-23 09:30:07 +01:00
sync_file.c dma-fence: Report the composite sync_file status 2019-08-12 10:37:52 +01:00
sync_trace.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
udmabuf.c udmabuf: actually unmap the scatterlist 2019-06-05 10:41:17 +02:00