Introducing more usage of dma-fence-chain and dma-fence-array in the
i915 driver we start to hit lockdep splats due to the recursive fence
locking in the dma-fence-chain and dma-fence-array containers.
This is a humble suggestion to try to establish a dma-fence locking order
(patch 1) and to avoid excessive recursive locking in these containers
(patch 2)
Thomas Hellström (2):
dma-fence: Avoid establishing a locking order between fence classes
dma-fence: Avoid excessive recursive fence locking from
enable_signaling() callbacks
drivers/dma-buf/dma-fence-array.c | 23 +++++++--
drivers/dma-buf/dma-fence-chain.c | 12 ++++-
drivers/dma-buf/dma-fence.c | 79 +++++++++++++++++++++----------
include/linux/dma-fence.h | 4 ++
4 files changed, 89 insertions(+), 29 deletions(-)
Cc: linaro-mm-sig@xxxxxxxxxxxxxxxx
Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
Cc: Christian König <christian.koenig@xxxxxxx>
--
2.31.1
