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Subject[PATCH] iommu/arm-smmu-v3: Implement shutdown method
Date
The shutdown method disables the SMMU and its interrupts to avoid
potentially corrupting a new kernel started with kexec.

Signed-off-by: Nate Watterson <nwatters@codeaurora.org>
---
drivers/iommu/arm-smmu-v3.c | 11 +++++++++++
1 file changed, 11 insertions(+)

diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index 380969a..907d576 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -2765,9 +2765,19 @@ static int arm_smmu_device_remove(struct platform_device *pdev)
struct arm_smmu_device *smmu = platform_get_drvdata(pdev);

arm_smmu_device_disable(smmu);
+
+ /* Disable IRQs */
+ arm_smmu_write_reg_sync(smmu, 0, ARM_SMMU_IRQ_CTRL,
+ ARM_SMMU_IRQ_CTRLACK);
+
return 0;
}

+static void arm_smmu_device_shutdown(struct platform_device *pdev)
+{
+ arm_smmu_device_remove(pdev);
+}
+
static struct of_device_id arm_smmu_of_match[] = {
{ .compatible = "arm,smmu-v3", },
{ },
@@ -2781,6 +2791,7 @@ static int arm_smmu_device_remove(struct platform_device *pdev)
},
.probe = arm_smmu_device_probe,
.remove = arm_smmu_device_remove,
+ .shutdown = arm_smmu_device_shutdown,
};
module_platform_driver(arm_smmu_driver);

--
Qualcomm Datacenter Technologies, Inc. on behalf of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux
Foundation Collaborative Project.
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