drm/amdgpu: fix NPA-RELEASE race in UALink exporter cleanup

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Processing of NPA-RELEASE messages can run concurrently with
sending of NPA-REVOKEs to all the importers. This can lead to
a race condition where the interrupt handler can signal npa_done
as soon as npa_release_bitmap becomes empty even though the cleanup
worker was still sending NPA-REVOKEs to all the importers. This would
prevent the cleanup worker thread to wait for all NPA-RELEASE messages
to come before freeing the NPA addresses.
Fix this by setting the importer_bitmap for all importers before sending
any NPA-REVOKE messages.

Signed-off-by: Mukul Joshi <mukul.joshi@amd.com>
Reviewed-by: Felix Kuehling <felix.kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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Mukul Joshi 2026-06-17 14:15:15 -04:00 • committed by Alex Deucher

parent 39d44c077b

commit 5731610e3c

1 changed files with 11 additions and 3 deletions

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drivers/gpu/drm/amd/amdgpu/amdgpu_ualink.c

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