linux-kernel - Re: [PATCH] usb: clock.c : usb true/false for bool return type

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Date:   Tue, 29 Oct 2019 10:03:16 +0100
From:   Takashi Iwai <tiwai@...e.de>
To:     Saurav Girepunje <saurav.girepunje@...il.com>
Cc:     perex@...ex.cz, tiwai@...e.com, rfontana@...hat.com,
        gregkh@...uxfoundation.org, allison@...utok.net,
        tglx@...utronix.de, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org, saurav.girepunje@...mail.com
Subject: Re: [PATCH] usb: clock.c : usb true/false for bool return type

On Tue, 29 Oct 2019 09:35:11 +0100,
Saurav Girepunje wrote:
> 
> Use true/false for bool type return in uac_clock_source_is_valid().
> 
> Signed-off-by: Saurav Girepunje <saurav.girepunje@...il.com>
> ---
>  sound/usb/clock.c | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/sound/usb/clock.c b/sound/usb/clock.c
> index 6b8c14f9b5d4..8b8ab83fac0d 100644
> --- a/sound/usb/clock.c
> +++ b/sound/usb/clock.c
> @@ -165,21 +165,21 @@ static bool uac_clock_source_is_valid(struct snd_usb_audio *chip,
>  			snd_usb_find_clock_source_v3(chip->ctrl_intf, source_id);
>  
>  		if (!cs_desc)
> -			return 0;
> +			return false;
>  		bmControls = le32_to_cpu(cs_desc->bmControls);
>  	} else { /* UAC_VERSION_1/2 */
>  		struct uac_clock_source_descriptor *cs_desc =
>  			snd_usb_find_clock_source(chip->ctrl_intf, source_id);
>  
>  		if (!cs_desc)
> -			return 0;
> +			return false;
>  		bmControls = cs_desc->bmControls;
>  	}
>  
>  	/* If a clock source can't tell us whether it's valid, we assume it is */
>  	if (!uac_v2v3_control_is_readable(bmControls,
>  				      UAC2_CS_CONTROL_CLOCK_VALID))
> -		return 1;
> +		return true;
>  
>  	err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_CUR,
>  			      USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
> @@ -191,10 +191,10 @@ static bool uac_clock_source_is_valid(struct snd_usb_audio *chip,
>  		dev_warn(&dev->dev,
>  			 "%s(): cannot get clock validity for id %d\n",
>  			   __func__, source_id);
> -		return 0;
> +		return false;
>  	}
>  
> -	return !!data;
> +	return !!data ? true :  false;

This doesn't need the ternary operator here.  Or drop "!!".

(Actually it would work just return data without "!!" for bool type,
 but maybe it's still clearer to have it.)

Also, please align the subject line with other commits.  For
USB-audio, it's "ALSA: usb-audio: Subject..."


thanks,

Takashi