diff options
| author | Joerg Roedel <joerg.roedel@amd.com> | 2010-05-28 14:26:48 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-07-05 11:22:24 -0700 |
| commit | fdb4f05da375cad6e74a6ba5d07dbb7a97d5c8c7 (patch) | |
| tree | c5f7dcbc614f2540b0f8d40fe766e9787c3f4b12 /arch | |
| parent | 65aa78d8d9621fb72bbf37a25a7bb1cc745ec171 (diff) | |
x86/amd-iommu: Fix crash when request_mem_region fails
commit e82752d8b5a7e0a5e4d607fd8713549e2a4e2741 upstream.
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.
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'arch')
| -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 6360abf993d4..890af003488c 100644 --- a/arch/x86/kernel/amd_iommu_init.c +++ b/arch/x86/kernel/amd_iommu_init.c @@ -286,8 +286,12 @@ 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) @@ -1313,7 +1317,7 @@ static int __init amd_iommu_init(void) ret = amd_iommu_init_dma_ops(); if (ret) - goto free; + goto free_disable; amd_iommu_init_api(); @@ -1331,9 +1335,10 @@ 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, |