linux-kernel - [PATCH] PCI: qcom: Fix using uninitialized smmu_sid

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Message-Id: <20201209020817.12776-1-mani@kernel.org>
Date:   Wed,  9 Dec 2020 07:38:17 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     lorenzo.pieralisi@....com
Cc:     agross@...nel.org, bjorn.andersson@...aro.org,
        svarbanov@...sol.com, bhelgaas@...gle.com,
        linux-arm-msm@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org, mgautam@...eaurora.org,
        truong@...eaurora.org, Manivannan Sadhasivam <mani@...nel.org>,
        kernel test robot <lkp@...el.com>
Subject: [PATCH] PCI: qcom: Fix using uninitialized smmu_sid_base variable

smmu_sid_base should hold the base of SMMU SID extracted from the first
entry of iommu-map. This value will be used to extract the successive SMMU
SID values. Fix it by assigning the first SMMU SID base before for loop.

Reported-by: kernel test robot <lkp@...el.com>
Signed-off-by: Manivannan Sadhasivam <mani@...nel.org>
---
 drivers/pci/controller/dwc/pcie-qcom.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
index 8ba3e6b29196..affa2713bf80 100644
--- a/drivers/pci/controller/dwc/pcie-qcom.c
+++ b/drivers/pci/controller/dwc/pcie-qcom.c
@@ -1297,6 +1297,9 @@ static int qcom_pcie_config_sid_sm8250(struct qcom_pcie *pcie)
 	/* Registers need to be zero out first */
 	memset_io(bdf_to_sid_base, 0, CRC8_TABLE_SIZE * sizeof(u32));
 
+	/* Extract the SMMU SID base from the first entry of iommu-map */
+	smmu_sid_base = map[0].smmu_sid;
+
 	/* Look for an available entry to hold the mapping */
 	for (i = 0; i < nr_map; i++) {
 		u16 bdf_be = cpu_to_be16(map[i].bdf);
-- 
2.25.1