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

[Rob Herring]

On Fri, Jun 10, 2022 at 11:25:32AM +0300, Serge Semin wrote:
> 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@xxxxxxxxxxxxxxxxxxxx>
> Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx>
> Tested-by: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx>
> ---
>  drivers/pci/controller/dwc/pcie-designware-plat.c | 9 +++++----
>  1 file changed, 5 insertions(+), 4 deletions(-)

Reviewed-by: Rob Herring <robh@xxxxxxxxxx>