accel/amdxdna: Fix unexpected wait when flushing notifier_wq

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In amdxdna_gem_obj_free(), flush_workqueue(xdna->notifier_wq) waits for
all pending work items on the device-global notifier workqueue, rather
than only the work items associated with the BO being freed.

If another BO has a pending hmm_unreg_work, freeing an unrelated BO can
be unnecessarily blocked until that work completes.

mmu_interval_notifier_remove() is deferred to a workqueue because it
cannot be called from the MMU notifier callback itself. The BO free path
is not a notifier callback, so call mmu_interval_notifier_remove()
directly there and avoid the workqueue.

Fixes: e486147c91 ("accel/amdxdna: Add BO import and export")
Reviewed-by: Max Zhen <max.zhen@amd.com>
Signed-off-by: Lizhi Hou <lizhi.hou@amd.com>
Link: https://patch.msgid.link/20260813205016.941743-1-lizhi.hou@amd.com

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This commit is contained in:

Lizhi Hou 2026-08-13 13:50:16 -07:00

parent 0116f19db5

commit 445d209104

2 changed files with 47 additions and 23 deletions

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69

drivers/accel/amdxdna/amdxdna_gem.c

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1

drivers/accel/amdxdna/amdxdna_gem.h

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