Chris Wilson 182c594668 dma-buf/fence: Fix lock inversion within dma-fence-array ... [ Upstream commit 03e4e0a9e0 ] Ages ago Rob Clark noted, "Currently with fence-array, we have a potential deadlock situation. If we fence_add_callback() on an array-fence, the array-fence's lock is acquired first, and in it's ->enable_signaling() callback, it will install cbs on it's array-member fences, so the array-member's lock is acquired second. But in the signal path, the array-member's lock is acquired first, and the array-fence's lock acquired second." Rob proposed either extensive changes to dma-fence to unnest the fence-array signaling, or to defer the signaling onto a workqueue. This is a more refined version of the later, that should keep the latency of the fence signaling to a minimum by using an irq-work, which is executed asap. Reported-by: Rob Clark <robdclark@gmail.com> Suggested-by: Rob Clark <robdclark@gmail.com> References: 1476635975-21981-1-git-send-email-robdclark@gmail.com Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Rob Clark <robdclark@gmail.com> Cc: Gustavo Padovan <gustavo.padovan@collabora.co.uk> Cc: Sumit Semwal <sumit.semwal@linaro.org> Cc: Christian König <christian.koenig@amd.com> Reviewed-by: Christian König <christian.koenig@amd.com> Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org> Link: https://patchwork.freedesktop.org/patch/msgid/20171114162719.30958-1-chris@chris-wilson.co.uk Signed-off-by: Sasha Levin <alexander.levin@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2018-03-19 08:42:47 +01:00
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dma-buf.c	dma-buf: Adjust a null pointer check in dma_buf_attach()	2017-05-08 20:50:21 +05:30
dma-fence-array.c	dma-buf/fence: Fix lock inversion within dma-fence-array	2018-03-19 08:42:47 +01:00
dma-fence.c	Linux 4.13-rc2	2017-07-27 08:15:43 +10:00
Kconfig	dma-buf: Rename struct fence to dma_fence	2016-10-25 14:40:39 +02:00
Makefile	dma-buf: Rename struct fence to dma_fence	2016-10-25 14:40:39 +02:00
reservation.c	dma-buf: fix reservation_object_wait_timeout_rcu once more v2	2018-02-22 15:42:17 +01:00
seqno-fence.c	dma-buf: Rename struct fence to dma_fence	2016-10-25 14:40:39 +02:00
sw_sync.c	dma-buf/sw_sync: force signal all unsignaled fences on dying timeline	2017-12-10 13:40:44 +01:00
sync_debug.c	Linux 4.13-rc2	2017-07-27 08:15:43 +10:00
sync_debug.h	dma-buf/sw-sync: Use an rbtree to sort fences in the timeline	2017-06-29 18:54:07 -03:00
sync_file.c	sync_file: Return consistent status in SYNC_IOC_FILE_INFO	2017-10-09 13:09:19 -03:00
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