[RFC PATCH 0/2] Attempt to avoid dma-fence-[chain|array] lockdep splats

[Thomas Hellström]

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 at lists.linaro.org
Cc: dri-devel at lists.freedesktop.org
Cc: Christian König <christian.koenig at amd.com>

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2.31.1