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linux-stable/drivers/dma-buf
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Rob Clark e531fdb5cd dma-buf/sw_sync: Avoid recursive lock during fence signal 
If a signal callback releases the sw_sync fence, that will trigger a
deadlock as the timeline_fence_release recurses onto the fence->lock
(used both for signaling and the the timeline tree).

To avoid that, temporarily hold an extra reference to the signalled
fences until after we drop the lock.

(This is an alternative implementation of https://patchwork.kernel.org/patch/11664717/
which avoids some potential UAF issues with the original patch.)

v2: Remove now obsolete comment, use list_move_tail() and
    list_del_init()

Reported-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Fixes: d3c6dd1fb3 ("dma-buf/sw_sync: Synchronize signal vs syncpt free")
Signed-off-by: Rob Clark <robdclark@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20230818145939.39697-1-robdclark@gmail.com
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Christian König <christian.koenig@amd.com>
2023-08-23 10:22:49 +02:00
..
heaps - Nick Piggin's "shoot lazy tlbs" series, to improve the peformance of 2023-04-27 19:42:02 -07:00
dma-buf-sysfs-stats.c dma-buf: make kobj_type structure constant 2023-02-17 10:59:14 +01:00
dma-buf-sysfs-stats.h dma-buf: fix dma_buf_export init order v2 2022-12-13 08:31:45 +01:00
dma-buf.c dma-buf: Include missing parentheses to documentation 2023-03-03 14:35:09 -03:00
dma-fence-array.c dma-buf/fence-array: Add fence deadline support 2023-03-25 10:55:07 -07:00
dma-fence-chain.c dma-buf/fence-chain: Add fence deadline support 2023-03-28 13:38:52 -07:00
dma-fence-unwrap.c dma-buf: keep the signaling time of merged fences v3 2023-07-03 13:47:06 +02:00
dma-fence.c dma-buf: fix an error pointer vs NULL bug 2023-07-06 19:50:23 +05:30
dma-heap.c driver core: class: remove module * from class_create() 2023-03-17 15:16:33 +01:00
dma-resv.c dma-buf/dma-resv: Stop leaking on krealloc() failure 2023-07-15 13:57:30 +02:00
Kconfig dma-buf: deprecate DMABUF_SYSFS_STATS 2022-06-23 10:51:43 +02:00
Makefile dma-buf: cleanup dma_fence_unwrap implementation 2022-05-30 14:16:32 +02:00
selftest.c
selftest.h
selftests.h dma-buf: add dma_fence_unwrap v2 2022-03-25 14:18:28 +01:00
st-dma-fence-chain.c treewide: use get_random_u32_inclusive() when possible 2022-11-18 02:18:02 +01:00
st-dma-fence-unwrap.c dma-buf: Enable signaling on fence for selftests 2022-09-16 15:53:25 +02:00
st-dma-fence.c dma-buf: Enable signaling on fence for selftests 2022-09-16 15:53:25 +02:00
st-dma-resv.c dma-buf: Enable signaling on fence for selftests 2022-09-16 15:53:25 +02:00
sw_sync.c dma-buf/sw_sync: Avoid recursive lock during fence signal 2023-08-23 10:22:49 +02:00
sync_debug.c
sync_debug.h
sync_file.c dma-buf/sync_file: use strscpy to replace strlcpy 2022-08-10 13:50:49 +02:00
sync_trace.h
udmabuf.c udmabuf: revert 'Add support for mapping hugepages (v4)' 2023-06-19 13:19:32 -07:00