[PATCH v4 01/15] iommu/arm-smmu-v3: Disable the impl before disabling the SMMU on shutdown

[Nicolin Chen <nicolinc@nvidia.com>]

arm_smmu_device_shutdown() only calls arm_smmu_device_disable(), and never
the impl_ops->device_disable() hook. On tegra241-cmdqv, that hook quiesces
every VINTF through tegra241_vintf_hw_deinit(), which issues a CMD_SYNC on
the shared CMDQ while it is still enabled.

arm_smmu_disable_action() already runs this hook before disabling the SMMU,
to cover an unbind or a probe failure, and no devres release ever follows a
reboot or a kexec to run it again. Have arm_smmu_device_shutdown() call it
directly, instead of reimplementing part of what it already does.

Fixes: 9ff145a25c5c ("iommu/tegra241-cmdqv: Fix CMD_SYNC use-after-free on teardown")
Cc: stable@vger.kernel.org
Assisted-by: Claude:claude-sonnet-5
Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
---
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
index 5732f3ba0122d..81baafaffc410 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -5633,7 +5633,7 @@ static void arm_smmu_device_shutdown(struct platform_device *pdev)
 {
 	struct arm_smmu_device *smmu = platform_get_drvdata(pdev);
 
-	arm_smmu_device_disable(smmu);
+	arm_smmu_disable_action(smmu);
 }
 
 static const struct of_device_id arm_smmu_of_match[] = {
-- 
2.43.0