PCI: dwc: Fix setting error return on MSI DMA mapping failure

[ 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@huawei.com>
Signed-off-by: Jiantao Zhang <water.zhangjiantao@huawei.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
index f4755f3a03bea1bc1b181fee82fd006af1891a4f..9dcb51728dd181be06ba728b97ba618c268ea32f 100644 (file)
--- 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;