linux-kernel - Re: [PATCH 1/7] Staging: rtl8192e: Added blank lines before/after struct

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Date:   Wed, 29 Jun 2022 14:11:24 +0200
From:   Felix Schlepper <f3sch.git@...look.com>
To:     Joe Perches <joe@...ches.com>
Cc:     gregkh@...uxfoundation.org, linux-staging@...ts.linux.dev,
        linux-kernel@...r.kernel.org, wjsota@...il.com
Subject: Re: [PATCH 1/7] Staging: rtl8192e: Added blank lines before/after
 struct

On 28.06.2022 10:58, Joe Perches wrote:
> On Tue, 2022-06-28 at 10:30 +0200, Felix Schlepper wrote:
> > This addresses an issue raised by checkpatch.pl:
> > 
> >      $ ./scripts/checkpatch.pl --terse -f drivers/staging/rtl8192e/rtllib_wx.c
> >      CHECK: Please use a blank line after function/struct/union/enum
> >      declarations
> > 
> > The additional blank line above the struct/before the headers is
> > just cleaner.
> []
> > diff --git a/drivers/staging/rtl8192e/rtllib_wx.c b/drivers/staging/rtl8192e/rtllib_wx.c
> []
> > @@ -17,10 +17,12 @@
> >  #include <linux/module.h>
> >  #include <linux/etherdevice.h>
> >  #include "rtllib.h"
> > +
> >  struct modes_unit {
> >  	char *mode_string;
> >  	int mode_size;
> >  };
> > +
> >  static struct modes_unit rtllib_modes[] = {
> >  	{"a", 1},
> >  	{"b", 1},
> 
> Please always look deeper at the code and do not simply take
> any checkpatch suggestion as the "best" fix.
> 
> Using this struct style with an embedded length is error prone
> and would likely be better as a simple char * array.
> 
> Also, the existing sprintf use of mode_string and mode_size is
> nonsensical.  There is nothing to format in any of the mode_size.
> so the use of mode_size as an argument is silly.
First of all, thank you for your suggestions.
I did realize that there is nothing to format, but I did not dare to
make that change in case a format could be added.
However, looking at it now. This has not been touched in over 10 years.
So it is probably safe to change that.
>
> Perhaps something like this would be better:
> ---
>  drivers/staging/rtl8192e/rtllib_wx.c | 21 +++++----------------
>  1 file changed, 5 insertions(+), 16 deletions(-)
> 
> diff --git a/drivers/staging/rtl8192e/rtllib_wx.c b/drivers/staging/rtl8192e/rtllib_wx.c
> index cf9a240924f20..90dcce152d80c 100644
> --- a/drivers/staging/rtl8192e/rtllib_wx.c
> +++ b/drivers/staging/rtl8192e/rtllib_wx.c
> @@ -17,17 +17,9 @@
>  #include <linux/module.h>
>  #include <linux/etherdevice.h>
>  #include "rtllib.h"
> -struct modes_unit {
> -	char *mode_string;
> -	int mode_size;
> -};
> -static struct modes_unit rtllib_modes[] = {
> -	{"a", 1},
> -	{"b", 1},
> -	{"g", 1},
> -	{"?", 1},
> -	{"N-24G", 5},
> -	{"N-5G", 4},
> +
> +static const char *rtllib_modes[] = {
> +	"a", "b", "g", "?", "N-24G", "N-5G",
>  };
>  
>  #define MAX_CUSTOM_LEN 64
> @@ -72,11 +64,8 @@ static inline char *rtl819x_translate_scan(struct rtllib_device *ieee,
>  	/* Add the protocol name */
>  	iwe.cmd = SIOCGIWNAME;
>  	for (i = 0; i < ARRAY_SIZE(rtllib_modes); i++) {
> -		if (network->mode&(1<<i)) {
> -			sprintf(pname, rtllib_modes[i].mode_string,
> -				rtllib_modes[i].mode_size);
> -			pname += rtllib_modes[i].mode_size;
> -		}
> +		if (network->mode & BIT(i))
> +			pname = stpcpy(pname, rtllib_modes[i]);
>  	}
>  	*pname = '\0';
Would this not be also redundant since stpcpy already returns a pointer to the new
NUL-terminating character?
>  	snprintf(iwe.u.name, IFNAMSIZ, "IEEE802.11%s", proto_name);
>
Will resubmit later.

Cheers
Felix Schlepper