[PATCH v4 16/18] PCI: dwc-plat: Simplify the probe method return value handling

Serge Semin
2022-06-10T08:30:24Z

The whole switch-case-logic implemented in the DWC PCIe RC/EP probe
procedure doesn't seem well thought through. First of all the ret variable
is unused in the EP-case and is only partly involved in the RC-case of the
switch-case statement, which unnecessary complicates the code. Secondly
the probe method will return zero if an unknown mode is detected. That is
improbable situation since the OF-device data is initialized only with
valid modes, but such code is still wrong at least from maintainability
point of view. So let's convert the switch-case part of the probe function
to being more coherent. We suggest to use the local ret variable to
preserve the status of the case-clauses and return its value from the
probe procedure after the work is done.

Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Tested-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
---
drivers/pci/controller/dwc/pcie-designware-plat.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-designware-plat.c b/drivers/pci/controller/dwc/pcie-designware-plat.c
index 97de6ad7f9db..c6871bebf3fe 100644
--- a/drivers/pci/controller/dwc/pcie-designware-plat.c
+++ b/drivers/pci/controller/dwc/pcie-designware-plat.c
@@ -143,20 +143,21 @@ static int dw_plat_pcie_probe(struct platform_device *pdev)
return -ENODEV;

ret = dw_plat_add_pcie_port(dw_plat_pcie, pdev);
- if (ret < 0)
- return ret;
break;
case DW_PCIE_EP_TYPE:
if (!IS_ENABLED(CONFIG_PCIE_DW_PLAT_EP))
return -ENODEV;

pci->ep.ops = &pcie_ep_ops;
- return dw_pcie_ep_init(&pci->ep);
+ ret = dw_pcie_ep_init(&pci->ep);
+ break;
default:
dev_err(dev, "INVALID device type %d\n", dw_plat_pcie->mode);
+ ret = -EINVAL;
+ break;
}

- return 0;
+ return ret;
}

static const struct dw_plat_pcie_of_data dw_plat_pcie_rc_of_data = {
--
2.35.1