[PATCH 0/3] iommu/vsi: Fix the domain locking and a probe leak

[Arun Iyengar via B4 Relay <devnull+aiyengar1990.gmail.com@kernel.org>]

Patch 1 stops identity attach and resume from locking memory past the
static identity domain. Patch 2 takes the old domain's lock to unlink
the IOMMU from its list. Patch 3 fixes a clock prepare leak in probe.
Patches 1 and 2 were found by Sashiko on my vsi-iommu-pm-ref v1 [1] and
hantro-robust v1.

Based on [1]. No conflict with vsi-iommu-disable v1 [2].

Tested on an Orange Pi 5 (RK3588S) with a v7.3-based kernel: the AV1
decoder's IOMMU group switched to identity and back to DMA, then an AV1
decode; 5 unbind/bind cycles of the decoder; VP8 and AV1 fluster with no
new failures; no splats. Patch 2's race and patch 3's error path were
not reproduced.

Developed with Claude (Anthropic), which wrote the code and the commit
messages. I reviewed every change.

[1] https://lore.kernel.org/r/20261113-vsi-iommu-pm-ref-v1-0-fd917eebdf18@gmail.com
[2] https://lore.kernel.org/r/20261113-vsi-iommu-disable-v1-1-94f7f44540b3@gmail.com

Signed-off-by: Arun Iyengar <aiyengar1990@gmail.com>
---
Arun Iyengar (3):
      iommu/vsi: Don't use the identity domain as a paging domain
      iommu/vsi: Unlink the IOMMU from its old domain under that domain's lock
      iommu/vsi: Unprepare the clocks when getting the IRQ fails

 drivers/iommu/vsi-iommu.c | 54 ++++++++++++++++++++++++++++-------------------
 1 file changed, 32 insertions(+), 22 deletions(-)
---
base-commit: 2cf4be57b301ed2d7af82e70cff5dfd96894d8de
change-id: 20261113-iommu-vsi-fixes-dc26821295cd
prerequisite-patch-id: 8b7b6e1a9abc4998ef53e7bc992d739bc1b53c94
prerequisite-patch-id: 27aee835025b1b64907a2e0e4e42e3eff120e86b

Best regards,
--  
Arun Iyengar <aiyengar1990@gmail.com>