linux-kernel - Re: [PATCH] staging: r8188eu: Remove goto to no-op exit label

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Message-ID: <YkdjhGtMwnbJcz+P@iweiny-desk3>
Date:   Fri, 1 Apr 2022 13:41:40 -0700
From:   Ira Weiny <ira.weiny@...el.com>
To:     "Fabio M. De Francesco" <fmdefrancesco@...il.com>
Cc:     Larry Finger <Larry.Finger@...inger.net>,
        Phillip Potter <phil@...lpotter.co.uk>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org,
        outreachy@...ts.linux.dev
Subject: Re: [PATCH] staging: r8188eu: Remove goto to no-op exit label

On Fri, Apr 01, 2022 at 08:35:13PM +0200, Fabio M. De Francesco wrote:
> In function rtw_free_netdev() there are two "goto" jumps to a no-op exit
> label called "RETURN". Remove the label and return in line.

Thanks for the patch!  However, A good commit message lists the why and what of
a change.  I don't see a why for this commit?

FWIW (For what it's worth) I know of a couple of good reasons for this change
but you should get in the habit of putting that in the commit message.  Even
for obvious things like this.

Anyway, I think this patch can stand on it's own with an updated commit
message.  However, see below...

> 
> Signed-off-by: Fabio M. De Francesco <fmdefrancesco@...il.com>
> ---
>  drivers/staging/r8188eu/os_dep/osdep_service.c | 7 ++-----
>  1 file changed, 2 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/staging/r8188eu/os_dep/osdep_service.c b/drivers/staging/r8188eu/os_dep/osdep_service.c
> index 7a6fcc96081a..d680bfba7f5d 100644
> --- a/drivers/staging/r8188eu/os_dep/osdep_service.c
> +++ b/drivers/staging/r8188eu/os_dep/osdep_service.c
> @@ -117,18 +117,15 @@ void rtw_free_netdev(struct net_device *netdev)
>  	struct rtw_netdev_priv_indicator *pnpi;
>  
>  	if (!netdev)
> -		goto RETURN;
> +		return;
>  
>  	pnpi = netdev_priv(netdev);
>  
>  	if (!pnpi->priv)
> -		goto RETURN;
> +		return;

This does not look right.  If netdev is not NULL why does this function skip
free_netdev()?

Fabio could you follow up with Larry and/or Phillip and see why the code does
this?  To me it looks like a potential bug.

Thanks!
Ira

>  
>  	vfree(pnpi->priv);
>  	free_netdev(netdev);
> -
> -RETURN:
> -	return;
>  }
>  
>  int rtw_change_ifname(struct adapter *padapter, const char *ifname)
> -- 
> 2.34.1
>