linux-kernel - Re: [PATCH 1/6] [media] tda8261: Use common error handling code in tda8261_set

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Date:   Tue, 26 Sep 2017 13:45:56 +0200
From:   Christoph Böhmwalder <christoph@...hmwalder.at>
To:     SF Markus Elfring <elfring@...rs.sourceforge.net>,
        linux-media@...r.kernel.org,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Max Kellermann <max.kellermann@...il.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH 1/6] [media] tda8261: Use common error handling code in
 tda8261_set_params()

On 26.09.2017 13:27, SF Markus Elfring wrote:
> From: Markus Elfring <elfring@...rs.sourceforge.net>
> Date: Tue, 26 Sep 2017 11:01:44 +0200
> 
> * Add a jump target so that a bit of exception handling can be better
>   reused at the end of this function.
> 
>   This issue was detected by using the Coccinelle software.
> 
> * The script "checkpatch.pl" pointed information out like the following.
> 
>   ERROR: do not use assignment in if condition
> 
>   Thus fix an affected source code place.
> 
> Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
> ---
>  drivers/media/dvb-frontends/tda8261.c | 20 ++++++++++++--------
>  1 file changed, 12 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/media/dvb-frontends/tda8261.c b/drivers/media/dvb-frontends/tda8261.c
> index 4eb294f330bc..5a8a9b6b8107 100644
> --- a/drivers/media/dvb-frontends/tda8261.c
> +++ b/drivers/media/dvb-frontends/tda8261.c
> @@ -129,18 +129,18 @@ static int tda8261_set_params(struct dvb_frontend *fe)
>  
>  	/* Set params */
>  	err = tda8261_write(state, buf);
> -	if (err < 0) {
> -		pr_err("%s: I/O Error\n", __func__);
> -		return err;
> -	}
> +	err = tda8261_get_status(fe, &status);
> +	if (err < 0)
> +		goto report_failure;
> +

Is this change really correct? Doesn't it query the status once more
often than before?

>  	/* sleep for some time */
>  	pr_debug("%s: Waiting to Phase LOCK\n", __func__);
>  	msleep(20);
>  	/* check status */
> -	if ((err = tda8261_get_status(fe, &status)) < 0) {
> -		pr_err("%s: I/O Error\n", __func__);
> -		return err;
> -	}
> +	err = tda8261_get_status(fe, &status);
> +	if (err < 0)
> +		goto report_failure;
> +
>  	if (status == 1) {
>  		pr_debug("%s: Tuner Phase locked: status=%d\n", __func__,
>  			 status);
> @@ -150,6 +150,10 @@ static int tda8261_set_params(struct dvb_frontend *fe)
>  	}
>  
>  	return 0;
> +
> +report_failure:
> +	pr_err("%s: I/O Error\n", __func__);
> +	return err;
>  }
>  
>  static void tda8261_release(struct dvb_frontend *fe)
> 


-- 
Regards,
Christoph



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