Ankit SoniandGreg Kroah-Hartman fca7aa0264 iommu/amd: serialize sequence allocation under concurrent TLB invalidations ...

commit 9e249c4841 upstream.

With concurrent TLB invalidations, completion wait randomly gets timed out
because cmd_sem_val was incremented outside the IOMMU spinlock, allowing
CMD_COMPL_WAIT commands to be queued out of sequence and breaking the
ordering assumption in wait_on_sem().
Move the cmd_sem_val increment under iommu->lock so completion sequence
allocation is serialized with command queuing.
And remove the unnecessary return.

Fixes: d2a0cac105 ("iommu/amd: move wait_on_sem() out of spinlock")

Tested-by: Srikanth Aithal <sraithal@amd.com>
Reported-by: Srikanth Aithal <sraithal@amd.com>
Signed-off-by: Ankit Soni <Ankit.Soni@amd.com>
Reviewed-by: Vasant Hegde <vasant.hegde@amd.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
[Salvatore Bonaccorso: Backport to v6.12.y where f32fe7cb01
("iommu/amd: Add support to remap/unmap IOMMU buffers for kdump") is not
present]
Signed-off-by: Salvatore Bonaccorso <carnil@debian.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

2026-05-14 15:29:17 +02:00

..

amd_iommu_types.h

iommu/amd: serialize sequence allocation under concurrent TLB invalidations

2026-05-14 15:29:17 +02:00

amd_iommu.h

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debugfs.c

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init.c

iommu/amd: serialize sequence allocation under concurrent TLB invalidations

2026-05-14 15:29:17 +02:00

io_pgtable_v2.c

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io_pgtable.c

iommu/amd/pgtbl: Fix possible race while increase page table level

2025-09-25 11:13:46 +02:00

iommu.c

iommu/amd: serialize sequence allocation under concurrent TLB invalidations

2026-05-14 15:29:17 +02:00

Kconfig

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Makefile

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pasid.c

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ppr.c

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quirks.c

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