linux-kernel - Re: [PATCH 05/11] watchdog: WatchDog Timer Driver Core - Add WDIOC_SETTIMEOUT and WDIOC

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Date:	Mon, 11 Jul 2011 23:34:45 +0200
From:	Wolfram Sang <w.sang@...gutronix.de>
To:	Wim Van Sebroeck <wim@...ana.be>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Linux Watchdog Mailing List <linux-watchdog@...r.kernel.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: [PATCH 05/11] watchdog: WatchDog Timer Driver Core - Add
 WDIOC_SETTIMEOUT and WDIOC_GETTIMEOUT ioctl

> diff --git a/drivers/watchdog/watchdog_dev.c b/drivers/watchdog/watchdog_dev.c
> index 530003b..0d4b16d 100644
> --- a/drivers/watchdog/watchdog_dev.c
> +++ b/drivers/watchdog/watchdog_dev.c
> @@ -201,6 +201,26 @@ static long watchdog_ioctl(struct file *file, unsigned int cmd,
>  			return -EOPNOTSUPP;
>  		watchdog_ping(wdd);
>  		return 0;
> +	case WDIOC_SETTIMEOUT:
> +		if ((wdd->ops->set_timeout == NULL) ||
> +		    !(wdd->info->options & WDIOF_SETTIMEOUT))
> +			return -EOPNOTSUPP;
> +		if (get_user(val, p))
> +			return -EFAULT;
> +		err = wdd->ops->set_timeout(wdd, val);
> +		if (err < 0)
> +			return err;
> +		wdd->timeout = val;
> +		/* If the watchdog is active then we sent a keepalive ping

s/sent/send/

> +		 * to make sure that the watchdog keep's running (and if
> +		 * possible that it takes the new timeout) */
> +		watchdog_ping(wdd);
> +		/* Fall */
> +	case WDIOC_GETTIMEOUT:
> +		/* timeout == 0 means that we don't know the timeout */
> +		if (wdd->timeout)
> +			return put_user(wdd->timeout, p);
> +		return -EOPNOTSUPP;

I'd suggest to swap the logic here (branch taken on error): 
 
        if (wdd->timeout == 0) 
                return -EOPNOTSUPP; 
        return put_user(); 

>  	default:
>  		return -ENOTTY;
>  	}

-- 
Pengutronix e.K.                           | Wolfram Sang                |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

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