When dma_mapping_error() returns error because of no enough memory available, dw_pcie_host_init() will return success, which will mislead the callers.
Fixes: 07940c369a6b ("PCI: dwc: Fix MSI page leakage in suspend/resume")
Signed-off-by: Jiantao Zhang <water.zhangjiantao@xxxxxxxxxx>
Signed-off-by: Jianrong Zhang <zhangjianrong5@xxxxxxxxxx>
---
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;
--
2.17.1
Jiantao Zhang
On 2022/3/5 5:39, Bjorn Helgaas wrote:
> On Fri, Mar 04, 2022 at 12:06:10PM +0000, Zhangjiantao(Kirin,Nanjing) wrote:
>> When dma_mapping_error returns error because of no enough memory available, dw_pcie_host_init will return success, which will mislead the callers.
> Wrap to fit in 75 columns, add "()" after function names.
>> Signed-off-by: zhangjianrong <zhangjianrong5@xxxxxxxxxx>
>> Signed-off-by: zhangjiantao <water.zhangjiantao@xxxxxxxxxx>
>>
>> ---
>> drivers/pci/controller/dwc/pcie-designware-host.c | 1 +
>> 1 file changed, 1 insertion(+)
>>
>> diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c
>> b/drivers/pci/controller/dwc/pcie-designware-host.c
>> index f4755f3a03be..ac691d733848 100644
>> --- a/drivers/pci/controller/dwc/pcie-designware-host.c
>> +++ b/drivers/pci/controller/dwc/pcie-designware-host.c
>> @@ -393,6 +393,7 @@ int dw_pcie_host_init(struct pcie_port *pp)
>> if (dma_mapping_error(pci->dev, pp->msi_data)) {
>> dev_err(pci->dev, "Failed to map MSI data\n");
>> pp->msi_data = 0;
>> + ret = -1;
> We should save the return value from dma_mapping_error() and return
> *that*, not -1.
>
> Whitespace error (indent with tabs, same as the surrounding code).
>
>> goto err_free_msi;
>> }
>> }
>> --
>> 2.17.1
>>
> .
