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Commit 4378d992 authored by Jay Cornwall's avatar Jay Cornwall Committed by Joerg Roedel
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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: default avatarJay Cornwall <jay.cornwall@amd.com>
Signed-off-by: default avatarSuravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Signed-off-by: default avatarJoerg Roedel <joro@8bytes.org>
parent e028a9e6

drivers/iommu/amd_iommu_v2.c

+2 −0
Original line number Original line Diff line number Diff line
@@ -504,8 +504,10 @@ static void do_fault(struct work_struct *work) 




	write = !!(fault->flags & PPR_FAULT_WRITE);

	write = !!(fault->flags & PPR_FAULT_WRITE);





	down_read(&fault->state->mm->mmap_sem);

	npages = get_user_pages(fault->state->task, fault->state->mm,

	npages = get_user_pages(fault->state->task, fault->state->mm,

				fault->address, 1, write, 0, &page, NULL);

				fault->address, 1, write, 0, &page, NULL);

	up_read(&fault->state->mm->mmap_sem);





	if (npages == 1) {

	if (npages == 1) {

		put_page(page);

		put_page(page);