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| author | Jay Cornwall <jay.cornwall@amd.com> | 2014-04-29 02:27:46 +0400 |
|---|---|---|
| committer | Joerg Roedel <joro@8bytes.org> | 2014-05-13 14:33:11 +0400 |
| commit | 4378d99295fae5fd42b0ed1a3eeef2a1684e0c17 (patch) | |
| tree | 2d2206643e5ad7353fba8393b1e6820daae45dc9 /drivers/iommu/amd_iommu_v2.c | |
| parent | e028a9e6b8a637af09ac4114083280df4a7045f1 (diff) | |
| download | linux-4378d99295fae5fd42b0ed1a3eeef2a1684e0c17.tar.xz | |
iommu/amd: Take mmap_sem when calling get_user_pages
get_user_pages requires caller to hold a read lock on mmap_sem.
Signed-off-by: Jay Cornwall <jay.cornwall@amd.com>
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Signed-off-by: Joerg Roedel <joro@8bytes.org>
Diffstat (limited to 'drivers/iommu/amd_iommu_v2.c')
| -rw-r--r-- | drivers/iommu/amd_iommu_v2.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/iommu/amd_iommu_v2.c b/drivers/iommu/amd_iommu_v2.c index 5208828792e6..203b2e6a91cf 100644 --- a/drivers/iommu/amd_iommu_v2.c +++ b/drivers/iommu/amd_iommu_v2.c @@ -504,8 +504,10 @@ static void do_fault(struct work_struct *work) write = !!(fault->flags & PPR_FAULT_WRITE); + down_read(&fault->state->mm->mmap_sem); npages = get_user_pages(fault->state->task, fault->state->mm, fault->address, 1, write, 0, &page, NULL); + up_read(&fault->state->mm->mmap_sem); if (npages == 1) { put_page(page); |