From: Jay Cornwall <[email protected]> get_user_pages requires caller to hold a read lock on mmap_sem.
Signed-off-by: Jay Cornwall <[email protected]> Signed-off-by: Suravee Suthikulpanit <[email protected]> --- drivers/iommu/amd_iommu_v2.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/iommu/amd_iommu_v2.c b/drivers/iommu/amd_iommu_v2.c index 5208828..203b2e6 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); -- 1.7.10.4 _______________________________________________ iommu mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/iommu
