iommu/amd: Warn only once on unexpected pte value

This prevents possible flooding of the kernel log.

Signed-off-by: Joerg Roedel <jroedel@suse.de>

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index 8b2be1e..3cdfac6 100644 (file)
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -2328,7 +2328,7 @@ static dma_addr_t dma_ops_domain_map(struct dma_ops_domain *dom,
        else if (direction == DMA_BIDIRECTIONAL)
                __pte |= IOMMU_PTE_IR | IOMMU_PTE_IW;
 
-       WARN_ON(*pte);
+       WARN_ON_ONCE(*pte);
 
        *pte = __pte;
 
@@ -2357,7 +2357,7 @@ static void dma_ops_domain_unmap(struct dma_ops_domain *dom,
 
        pte += PM_LEVEL_INDEX(0, address);
 
-       WARN_ON(!*pte);
+       WARN_ON_ONCE(!*pte);
 
        *pte = 0ULL;
 }