linux-kernel - [PATCH v3 1/2] iommu/vt-d: Handle the failure case of dmar_reenable

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Message-Id: <20230605112659.308981-2-yanfei.xu@intel.com>
Date:   Mon,  5 Jun 2023 19:26:58 +0800
From:   Yanfei Xu <yanfei.xu@...el.com>
To:     dwmw2@...radead.org, baolu.lu@...ux.intel.com, joro@...tes.org,
        will@...nel.org, robin.murphy@....com
Cc:     iommu@...ts.linux.dev, linux-kernel@...r.kernel.org,
        yanfei.xu@...el.com
Subject: [PATCH v3 1/2] iommu/vt-d: Handle the failure case of dmar_reenable_qi()

dmar_reenable_qi() may not succeed. Check and return when it fails.

Signed-off-by: Yanfei Xu <yanfei.xu@...el.com>
---
 drivers/iommu/intel/iommu.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index 8096273b034c..c13c6475b626 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -2967,10 +2967,15 @@ static int init_iommu_hw(void)
 {
 	struct dmar_drhd_unit *drhd;
 	struct intel_iommu *iommu = NULL;
+	int ret;
 
-	for_each_active_iommu(iommu, drhd)
-		if (iommu->qi)
-			dmar_reenable_qi(iommu);
+	for_each_active_iommu(iommu, drhd) {
+		if (iommu->qi) {
+			ret = dmar_reenable_qi(iommu);
+			if (ret)
+				return ret;
+		}
+	}
 
 	for_each_iommu(iommu, drhd) {
 		if (drhd->ignored) {
-- 
2.34.1