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iommu/amd: Clean up the cmpxchg64 invocation
author
Baoquan He
<bhe@redhat.com>
Thu, 15 Sep 2016 08:50:50 +0000
(16:50 +0800)
committer
Joerg Roedel
<jroedel@suse.de>
Mon, 19 Sep 2016 13:49:01 +0000
(15:49 +0200)
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>
drivers/iommu/amd_iommu.c
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diff --git
a/drivers/iommu/amd_iommu.c
b/drivers/iommu/amd_iommu.c
index
bebe728
..
897940c
100644
(file)
--- a/
drivers/iommu/amd_iommu.c
+++ b/
drivers/iommu/amd_iommu.c
@@
-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;
}