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iommu/amd: Don't call early_amd_iommu_init() when AMD IOMMU is disabled 

Don't even try to initialize the AMD IOMMU hardware when amd_iommu=off has been
passed on the kernel command line.

References: https://bugzilla.kernel.org/show_bug.cgi?id=212133
References: https://bugzilla.suse.com/show_bug.cgi?id=1183132
Cc: stable@vger.kernel.org # v5.11
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Link: https://lore.kernel.org/r/20210317091037.31374-3-joro@8bytes.org
Acked-by: Huang Rui <ray.huang@amd.com>
rM2-mainline
Joerg Roedel 2021-03-17 10:10:36 +01:00
parent 072a03e0a0
commit 9f81ca8d1f
1 changed files with 4 additions and 4 deletions
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8
drivers/iommu/amd/init.c
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@ -2919,12 +2919,12 @@ static int __init state_next(void)
}
break;
case IOMMU_IVRS_DETECTED:
ret = early_amd_iommu_init();
init_state = ret ? IOMMU_INIT_ERROR : IOMMU_ACPI_FINISHED;
if (init_state == IOMMU_ACPI_FINISHED && amd_iommu_disabled) {
pr_info("AMD IOMMU disabled\n");
if (amd_iommu_disabled) {
init_state = IOMMU_CMDLINE_DISABLED;
ret = -EINVAL;
} else {
ret = early_amd_iommu_init();
init_state = ret ? IOMMU_INIT_ERROR : IOMMU_ACPI_FINISHED;
}
break;
case IOMMU_ACPI_FINISHED: