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| author |   Kevin Mitchell <kevmitch@arista.com> | 2019-06-12 14:52:03 -0700 |
|---|---|---|
| committer |   Joerg Roedel <jroedel@suse.de> | 2019-07-01 14:02:33 +0200 |
| commit | 3ddbe913e55516d3e2165d43d4d5570761769878 (patch) | |
| tree | 6b02a53d2a7502365d7bbc541839ab8c008f3470 /drivers/iommu/amd_iommu_init.c | |
| parent | iommu/amd: Add missed 'tag' to error msg in iommu_print_event (diff) | |
| download | linux-dev-3ddbe913e55516d3e2165d43d4d5570761769878.tar.xz linux-dev-3ddbe913e55516d3e2165d43d4d5570761769878.zip | |
iommu/amd: Make iommu_disable safer
Make it safe to call iommu_disable during early init error conditions
before mmio_base is set, but after the struct amd_iommu has been added
to the amd_iommu_list. For example, this happens if firmware fails to
fill in mmio_phys in the ACPI table leading to a NULL pointer
dereference in iommu_feature_disable.
Fixes: 2c0ae1720c09c ('iommu/amd: Convert iommu initialization to state machine')
Signed-off-by: Kevin Mitchell <kevmitch@arista.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu/amd_iommu_init.c')
| -rw-r--r-- | drivers/iommu/amd_iommu_init.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c index f977df90d2a4..df144dc6d8ac 100644 --- a/drivers/iommu/amd_iommu_init.c +++ b/drivers/iommu/amd_iommu_init.c @@ -418,6 +418,9 @@ static void iommu_enable(struct amd_iommu *iommu) static void iommu_disable(struct amd_iommu *iommu) { + if (!iommu->mmio_base) + return; + /* Disable command buffer */ iommu_feature_disable(iommu, CONTROL_CMDBUF_EN); |