[PATCH v3 0/6] firmware: samsung: acpm: Various fixes for sashiko bug reports

[Tudor Ambarus]

Fixes for bugs that were identified by sashiko when proposing the
GS101 ACPM TMU addition.

While the bugs are sane, we haven't hit them yet, maybe because we
don't have enough ACPM clients upstreamed. The fixes can go either
as fixes at -rc phase, or as regular patches for the next merge window.
If the later, we'll need a dedicated branch, as these patches toghether
with the other ACPM thermal preparatory patches will be needed by the
GS101 ACPM thermal driver. I'm thinking a dedicated branch and a tag
will do. I will respin the GS101 ACPM thermal driver series once this
fixes set gets in.

Thanks,
ta

Signed-off-by: Tudor Ambarus <tudor.ambarus at linaro.org>
---
Changes in v3:
- validate more SRAM parameters and queue pointers (sashiko)
- consider/fix the acquire path (Krzysztof) - patch was moved
  last in the series to avoid touching the same code twice.
- Link to v2: https://lore.kernel.org/r/20260427-acpm-fixes-sashiko-reports-v2-0-1ff8de94a997@linaro.org

Changes in v2:
- drop patch "firmware: samsung: acpm: Fix sequence number leak and infinite loop"
  The patch freed sequence numbers on mailbox failures or timeouts. Because
  the message is already in SRAM and tx.front was advanced, a delayed
  firmware wake-up will process that abandoned message, stealing the
  sequence number from a new thread and causing silent data corruption.
- fix mailbox channel leak when `acpm_achan_alloc_cmds()` failed. Did it
  by  moving the `devm_add_action_or_reset()` call.
- new patches, last 3 in the set, they fix some more sashiko reports.
- Link to v1: https://lore.kernel.org/r/20260423-acpm-fixes-sashiko-reports-v1-0-2217b790925e@linaro.org

---
Tudor Ambarus (6):
      firmware: samsung: acpm: Fix cross-thread RX length corruption
      firmware: samsung: acpm: Fix mailbox channel leak on probe error
      firmware: samsung: acpm: Fix dummy stubs to return ERR_PTR
      firmware: samsung: acpm: Validate SRAM shared memory and queue pointers
      firmware: samsung: acpm: Fix infinite loop on sequence number exhaustion
      firmware: samsung: acpm: Fix memory ordering races in RX and polling paths

 drivers/firmware/samsung/exynos-acpm-dvfs.c        |   3 +
 drivers/firmware/samsung/exynos-acpm.c             | 113 ++++++++++++++++-----
 .../linux/firmware/samsung/exynos-acpm-protocol.h  |   3 +-
 3 files changed, 90 insertions(+), 29 deletions(-)
---
base-commit: 254f49634ee16a731174d2ae34bc50bd5f45e731
change-id: 20260423-acpm-fixes-sashiko-reports-ae28b6ed5581

Best regards,
-- 
Tudor Ambarus <tudor.ambarus at linaro.org>