diff options
| author | Jay Cornwall <jay.cornwall@amd.com> | 2014-02-22 13:35:38 -0600 |
|---|---|---|
| committer | Oded Gabbay <oded.gabbay@amd.com> | 2014-02-25 16:01:18 +0200 |
| commit | 6de6b9983fe5753e5e0081f6c5533941fa949c3d (patch) | |
| tree | 9e96ec26e1c3844fd6ce189bedbd8b576dbe7c6e | |
| parent | 600e8bd40644134a0776d5f8992b2ddaa2a2dc3b (diff) | |
iommu/amd: Take mmap_sem when calling get_user_pagesalpha-1
get_user_pages requires the caller to hold a read lock on mmap_sem.
Signed-off-by: Jay Cornwall <jay.cornwall@amd.com>
| -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 90034b3d3075..2abb33326ab6 100644 --- a/drivers/iommu/amd_iommu_v2.c +++ b/drivers/iommu/amd_iommu_v2.c @@ -485,8 +485,10 @@ 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); |