[PATCH] iommu/arm-smmu-v3: Implement shutdown method
From: Nate Watterson <hidden>
Date: 2017-06-29 17:45:06
Also in:
linux-iommu, lkml
Subsystem:
iommu subsystem, the rest · Maintainers:
Joerg Roedel, Will Deacon, Linus Torvalds
The shutdown method disables the SMMU and its interrupts to avoid potentially corrupting a new kernel started with kexec. Signed-off-by: Nate Watterson <redacted> --- 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);
--
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