linux-kernel - Re: [PATCH] Staging: vc04_services: Fix WARN_ON instead of BUG

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Date:   Mon, 31 Jul 2017 10:10:41 +0200
From:   Stefan Wahren <stefan.wahren@...e.com>
To:     janani-sankarababu <jananis37@...il.com>, eric@...olt.net
Cc:     devel@...verdev.osuosl.org, f.fainelli@...il.com,
        sbranden@...adcom.com, gregkh@...uxfoundation.org,
        vicmos89@...il.com, linux-kernel@...r.kernel.org,
        julia.lawall@...6.fr, mzoran@...wfest.net, sreyamittal5@...il.com,
        rjui@...adcom.com, aishpant@...il.com,
        linux-arm-kernel@...ts.infradead.org,
        linux-rpi-kernel@...ts.infradead.org
Subject: Re: [PATCH] Staging: vc04_services: Fix WARN_ON instead of BUG_ON

Am 31.07.2017 um 09:14 schrieb janani-sankarababu:
> This patch is to replace the use of BUG_ON macro with WARN_ON
> inorder to prevent the crashing of the kernel.

Unfortunately it isn't always that simple. checkpatch isn't smart. It's
preferred to handle error cases instead of flooding the kernel log.

>
> Signed-off-by: Janani Sankara Babu <jananis37@...il.com>
> ---
>  drivers/staging/vc04_services/bcm2835-audio/bcm2835-ctl.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/staging/vc04_services/bcm2835-audio/bcm2835-ctl.c b/drivers/staging/vc04_services/bcm2835-audio/bcm2835-ctl.c
> index f484bb0..30bc246 100644
> --- a/drivers/staging/vc04_services/bcm2835-audio/bcm2835-ctl.c
> +++ b/drivers/staging/vc04_services/bcm2835-audio/bcm2835-ctl.c
> @@ -91,7 +91,7 @@ static int snd_bcm2835_ctl_get(struct snd_kcontrol *kcontrol,
>  	if (mutex_lock_interruptible(&chip->audio_mutex))
>  		return -EINTR;
>  
> -	BUG_ON(!chip && !(chip->avail_substreams & AVAIL_SUBSTREAMS_MASK));
> +	WARN_ON(!chip && !(chip->avail_substreams & AVAIL_SUBSTREAMS_MASK));

The complete logic seems strange to me and the statement before didn't
even check for chip.

Regards
Stefan

>  
>  	if (kcontrol->private_value == PCM_PLAYBACK_VOLUME)
>  		ucontrol->value.integer.value[0] = chip2alsa(chip->volume);