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| author | Joerg Roedel <joerg.roedel@amd.com> | 2010-05-28 12:26:48 (GMT) |
|---|---|---|
| committer | Joerg Roedel <joerg.roedel@amd.com> | 2010-06-01 08:03:08 (GMT) |
| commit | e82752d8b5a7e0a5e4d607fd8713549e2a4e2741 (patch) | |
| tree | 4bc5c676e46c26083e46b77907fe7d588831f4f5 /arch/x86 | |
| parent | 1d61e73ab4c7470833241af888939a7aab2b0354 (diff) | |
| download | linux-e82752d8b5a7e0a5e4d607fd8713549e2a4e2741.tar.xz | |
x86/amd-iommu: Fix crash when request_mem_region fails
When request_mem_region fails the error path tries to
disable the IOMMUs. This accesses the mmio-region which was
not allocated leading to a kernel crash. This patch fixes
the issue.
Cc: stable@kernel.org
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/kernel/amd_iommu_init.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/arch/x86/kernel/amd_iommu_init.c b/arch/x86/kernel/amd_iommu_init.c index 3bacb4d..1405346 100644 --- a/arch/x86/kernel/amd_iommu_init.c +++ b/arch/x86/kernel/amd_iommu_init.c @@ -287,8 +287,12 @@ static u8 * __init iommu_map_mmio_space(u64 address) { u8 *ret; - if (!request_mem_region(address, MMIO_REGION_LENGTH, "amd_iommu")) + if (!request_mem_region(address, MMIO_REGION_LENGTH, "amd_iommu")) { + pr_err("AMD-Vi: Can not reserve memory region %llx for mmio\n", + address); + pr_err("AMD-Vi: This is a BIOS bug. Please contact your hardware vendor\n"); return NULL; + } ret = ioremap_nocache(address, MMIO_REGION_LENGTH); if (ret != NULL) @@ -1314,7 +1318,7 @@ static int __init amd_iommu_init(void) ret = amd_iommu_init_dma_ops(); if (ret) - goto free; + goto free_disable; amd_iommu_init_api(); @@ -1332,9 +1336,10 @@ static int __init amd_iommu_init(void) out: return ret; -free: +free_disable: disable_iommus(); +free: amd_iommu_uninit_devices(); free_pages((unsigned long)amd_iommu_pd_alloc_bitmap, |