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Message-Id: <20220607165002.614777042@linuxfoundation.org>
Date: Tue, 7 Jun 2022 19:00:54 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Jianrong Zhang <zhangjianrong5@...wei.com>,
Jiantao Zhang <water.zhangjiantao@...wei.com>,
Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
Rob Herring <robh@...nel.org>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.17 462/772] PCI: dwc: Fix setting error return on MSI DMA mapping failure
From: Jiantao Zhang <water.zhangjiantao@...wei.com>
[ Upstream commit 88557685cd72cf0db686a4ebff3fad4365cb6071 ]
When dma_mapping_error() returns error because of no enough memory,
but dw_pcie_host_init() returns success, which will mislead the callers.
Link: https://lore.kernel.org/r/30170911-0e2f-98ce-9266-70465b9073e5@huawei.com
Fixes: 07940c369a6b ("PCI: dwc: Fix MSI page leakage in suspend/resume")
Signed-off-by: Jianrong Zhang <zhangjianrong5@...wei.com>
Signed-off-by: Jiantao Zhang <water.zhangjiantao@...wei.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Reviewed-by: Rob Herring <robh@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
drivers/pci/controller/dwc/pcie-designware-host.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
index f4755f3a03be..9dcb51728dd1 100644
--- a/drivers/pci/controller/dwc/pcie-designware-host.c
+++ b/drivers/pci/controller/dwc/pcie-designware-host.c
@@ -390,7 +390,8 @@ int dw_pcie_host_init(struct pcie_port *pp)
sizeof(pp->msi_msg),
DMA_FROM_DEVICE,
DMA_ATTR_SKIP_CPU_SYNC);
- if (dma_mapping_error(pci->dev, pp->msi_data)) {
+ ret = dma_mapping_error(pci->dev, pp->msi_data);
+ if (ret) {
dev_err(pci->dev, "Failed to map MSI data\n");
pp->msi_data = 0;
goto err_free_msi;
--
2.35.1
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