From: Joerg Roedel <jroedel@suse.de>
Date: Mon, 21 Dec 2015 11:50:54 +0000 (+0100)
Subject: iommu/amd: Warn only once on unexpected pte value
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=a7fb668fd88c979e790f0c324a1a6d749a8c5a60;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

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 8b2be1e7714f..3cdfac6024a5 100644
--- 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;
 }