linux-kernel - Re: [PATCH 1/2] fpga: dfl: pci: reduce the scope of variable 'ret'

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Date:   Fri, 17 Apr 2020 09:56:05 +0800
From:   Xu Yilun <yilun.xu@...el.com>
To:     Tom Rix <trix@...hat.com>
Cc:     "Wu, Hao" <hao.wu@...el.com>, "mdf@...nel.org" <mdf@...nel.org>,
        "linux-fpga@...r.kernel.org" <linux-fpga@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "bhu@...hat.com" <bhu@...hat.com>
Subject: Re: [PATCH 1/2] fpga: dfl: pci: reduce the scope of variable 'ret'

Hi Rix:

This patch is based on linux-next. There is an preceding patch
(3c2760b78f90 "fpga: dfl: pci: fix return value of cci_pci_sriov_configure",
Also see Fixes:) in linux-next but not merged in 5.7-rc1 yet.
This patch is to fix the lkp warning brought by the previous one.

Thanks.

On Thu, Apr 16, 2020 at 09:56:47AM -0700, Tom Rix wrote:
> Please check the scope.
> 
> On linus/master, the result of this change looks like
> 
> static int cci_pci_sriov_configure(struct pci_dev *pcidev, int num_vfs)
> {
>     struct cci_drvdata *drvdata = pci_get_drvdata(pcidev);
>     struct dfl_fpga_cdev *cdev = drvdata->cdev;
> 
>     if (!num_vfs) {
>         /*
>          * disable SRIOV and then put released ports back to default
>          * PF access mode.
>          */
>         pci_disable_sriov(pcidev);
> 
>         dfl_fpga_cdev_config_ports_pf(cdev);
> 
>     } else {
>         int ret; <--- defined here
> 
>         /*
>          * before enable SRIOV, put released ports into VF access mode
>          * first of all.
>          */
>         ret = dfl_fpga_cdev_config_ports_vf(cdev, num_vfs);
>         if (ret)
>             return ret;
> 
>         ret = pci_enable_sriov(pcidev, num_vfs);
>         if (ret)
>             dfl_fpga_cdev_config_ports_pf(cdev);
>     }
> 
>     return ret;  <---- not in scope, not defined here
> }
> 
> Tom