linux-kernel - Re: [PATCH v2 19/20] staging: rtl8723bs: include macro in a do

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Message-ID: <YGByG/9r6yoylXJE@kroah.com>
Date:   Sun, 28 Mar 2021 14:10:03 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Fabio Aiuto <fabioaiuto83@...il.com>
Cc:     dan.carpenter@...cle.com, david.laight@...lab.com,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 19/20] staging: rtl8723bs: include macro in a do -
 while loop in core/rtw_security.c

On Sat, Mar 27, 2021 at 03:24:18PM +0100, Fabio Aiuto wrote:
> fix the following checkpatch warning:
> 
> ERROR: Macros with multiple statements should be enclosed
> in a do - while loop
> 2014: FILE: drivers/staging/rtl8723bs/core/rtw_security.c:2014:
> +#define ROUND(i, d, s) \
> 
> Signed-off-by: Fabio Aiuto <fabioaiuto83@...il.com>
> ---
>  drivers/staging/rtl8723bs/core/rtw_security.c | 10 ++++++----
>  1 file changed, 6 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/staging/rtl8723bs/core/rtw_security.c b/drivers/staging/rtl8723bs/core/rtw_security.c
> index 0ddd7667a986..8a447e149438 100644
> --- a/drivers/staging/rtl8723bs/core/rtw_security.c
> +++ b/drivers/staging/rtl8723bs/core/rtw_security.c
> @@ -2012,10 +2012,12 @@ static void rijndaelEncrypt(u32 rk[/*44*/], u8 pt[16], u8 ct[16])
>  	s3 = GETU32(pt + 12) ^ rk[3];
>  
>  #define ROUND(i, d, s) \
> -d##0 = TE0(s##0) ^ TE1(s##1) ^ TE2(s##2) ^ TE3(s##3) ^ rk[4 * i]; \
> -d##1 = TE0(s##1) ^ TE1(s##2) ^ TE2(s##3) ^ TE3(s##0) ^ rk[4 * i + 1]; \
> -d##2 = TE0(s##2) ^ TE1(s##3) ^ TE2(s##0) ^ TE3(s##1) ^ rk[4 * i + 2]; \
> -d##3 = TE0(s##3) ^ TE1(s##0) ^ TE2(s##1) ^ TE3(s##2) ^ rk[4 * i + 3]
> +	do { \
> +		d##0 = TE0(s##0) ^ TE1(s##1) ^ TE2(s##2) ^ TE3(s##3) ^ rk[4 * i]; \
> +		d##1 = TE0(s##1) ^ TE1(s##2) ^ TE2(s##3) ^ TE3(s##0) ^ rk[4 * i + 1]; \
> +		d##2 = TE0(s##2) ^ TE1(s##3) ^ TE2(s##0) ^ TE3(s##1) ^ rk[4 * i + 2]; \
> +		d##3 = TE0(s##3) ^ TE1(s##0) ^ TE2(s##1) ^ TE3(s##2) ^ rk[4 * i + 3]; \
> +	} while (0)

Why is this code not using the in-kernel crypto code instead?  I'll take
this but that should be something that is done to this code
eventually...

thanks,

greg k-h