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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>
This commit is contained in:
Joerg Roedel 2010-05-28 14:26:48 +02:00
parent 1d61e73ab4
commit e82752d8b5
1 changed files with 8 additions and 3 deletions
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11
arch/x86/kernel/amd_iommu_init.c
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@ -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,