diff options
Diffstat (limited to 'drivers/iommu/amd/io_pgtable.c')
| -rw-r--r-- | drivers/iommu/amd/io_pgtable.c | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/drivers/iommu/amd/io_pgtable.c b/drivers/iommu/amd/io_pgtable.c index 6608d1717574..7d4b61e5db47 100644 --- a/drivers/iommu/amd/io_pgtable.c +++ b/drivers/iommu/amd/io_pgtable.c @@ -258,7 +258,7 @@ static u64 *alloc_pte(struct protection_domain *domain, __npte = PM_LEVEL_PDE(level, iommu_virt_to_phys(page)); /* pte could have been changed somewhere. */ - if (cmpxchg64(pte, __pte, __npte) != __pte) + if (!try_cmpxchg64(pte, &__pte, __npte)) free_page((unsigned long)page); else if (IOMMU_PTE_PRESENT(__pte)) *updated = true; @@ -341,10 +341,8 @@ static void free_clear_pte(u64 *pte, u64 pteval, struct list_head *freelist) u64 *pt; int mode; - while (cmpxchg64(pte, pteval, 0) != pteval) { + while (!try_cmpxchg64(pte, &pteval, 0)) pr_warn("AMD-Vi: IOMMU pte changed since we read it\n"); - pteval = *pte; - } if (!IOMMU_PTE_PRESENT(pteval)) return; |