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iommu/amd: Clean up the cmpxchg64 invocation

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Change it as it's designed for and keep it consistent with other
places.

Signed-off-by: Baoquan He <bhe@redhat.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Baoquan He 2016-09-15 16:50:50 +08:00 committed by Joerg Roedel
parent 368d06cd53
commit 134414fffc
1 changed files with 2 additions and 1 deletions
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3
drivers/iommu/amd_iommu.c
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@ -1342,7 +1342,8 @@ static u64 *alloc_pte(struct protection_domain *domain,
__npte = PM_LEVEL_PDE(level, virt_to_phys(page));
if (cmpxchg64(pte, __pte, __npte)) {
/* pte could have been changed somewhere. */
if (cmpxchg64(pte, __pte, __npte) != __pte) {
free_page((unsigned long)page);
continue;
}