linux-kernel - Re: [PATCH 2/2] edac: pnd2_edac: remove useless variable assignment

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Message-ID: <20170622164345.Horde.SwUuX9eHAPqyFo5pq1RUp09@gator4166.hostgator.com>
Date:   Thu, 22 Jun 2017 16:43:45 -0500
From:   "Gustavo A. R. Silva" <garsilva@...eddedor.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     Tony Luck <tony.luck@...el.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-edac@...r.kernel.org, linux-kernel@...r.kernel.org,
        Qiuxu Zhuo <qiuxu.zhuo@...el.com>
Subject: Re: [PATCH 2/2] edac: pnd2_edac: remove useless variable assignment

Hi Borislav,

Quoting Borislav Petkov <bp@...en8.de>:

> On Thu, Jun 22, 2017 at 02:30:10PM -0500, Gustavo A. R. Silva wrote:
>> Value assigned to variable _ret_ at line 176 is overwritten
>> a few lines below before it can be used. This makes such
>> variable assignment useless.
>>
>> Addresses-Coverity-ID: 1403730
>
> Get rid of this tag...
>
>> Signed-off-by: Gustavo A. R. Silva <garsilva@...eddedor.com>
>> ---
>>  drivers/edac/pnd2_edac.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/edac/pnd2_edac.c b/drivers/edac/pnd2_edac.c
>> index c51ec73..d1de53e 100644
>> --- a/drivers/edac/pnd2_edac.c
>> +++ b/drivers/edac/pnd2_edac.c
>> @@ -173,7 +173,7 @@ static int apl_rd_reg(int port, int off, int  
>> op, void *data, size_t sz, char *na
>>  	edac_dbg(2, "Read %s port=%x off=%x op=%x\n", name, port, off, op);
>>  	switch (sz) {
>>  	case 8:
>> -		ret = sbi_send(port, off + 4, op, (u32 *)(data + 4));
>> +		sbi_send(port, off + 4, op, (u32 *)(data + 4));
>
> ... keep ret but OR it in with its previous value:
>
>         case 8:
>                 ret  = sbi_send(port, off + 4, op, (u32 *)(data + 4));
> 		/* fall through */
>         case 4:
>                 ret |= sbi_send(port, off, op, (u32 *)data);
>
>>  		/* fall through */
>>  	case 4:
>>  		ret = sbi_send(port, off, op, (u32 *)data);
>
> ... and merge both into a single patch.
>

I got it. I'll send a new patch shortly.

Thanks!
--
Gustavo A. R. Silva