linux

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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: d3c6dd1fb30d ("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