linux-kernel - Re: [PATCH] watchdog: Add support for the WM8350 watchdog

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Message-ID: <20081024123723.GQ30246@infomag.infomag.iguana.be>
Date:	Fri, 24 Oct 2008 14:37:23 +0200
From:	Wim Van Sebroeck <wim@...ana.be>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] watchdog: Add support for the WM8350 watchdog

Hi Marc,

Finally a stable ADSL line again. I just finished reviewing your driver:

> +static int wm8350_wdt_open(struct inode *inode, struct file *file)
> +{
> +	struct wm8350 *wm8350 = get_wm8350();
> +	int ret;
> +
> +	if (!wm8350) {
> +		printk(KERN_CRIT "FNORD\n");

:-) as you pointed out this should be removed.

> +static int wm8350_wdt_release(struct inode *inode, struct file *file)
> +{
> +	struct wm8350 *wm8350 = get_wm8350();
> +
> +	if (wm8350_wdt_expect_close)
> +		wm8350_wdt_stop(wm8350);
> +	else
> +		dev_warn(wm8350->dev, "Watchdog device closed uncleanly\n");

you should ping the watchdog if you don't stop it.

> +static int wm8350_wdt_ioctl(struct inode *inode, struct file *file,
> +			    unsigned int cmd, unsigned long arg)

we use the unlocked_ioctl call in watchdog drivers now. So this should be:
static long wm8350_wdt_ioctl(struct file *file, unsigned int cmd,
						unsigned long arg)

> +{
> +	struct wm8350 *wm8350 = get_wm8350();
> +	int ret = -ENOTTY, time, i;
> +	void __user *argp = (void __user *)arg;
> +	int __user *p = argp;
> +	u16 reg;
> +
> +	switch (cmd) {
> +	case WDIOC_GETSUPPORT:
> +		ret = copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
> +		break;
> +
> +	case WDIOC_GETSTATUS:

Bootstatus is a mandatory ioctl according to the API. So just add:
	case WDIOC_GETBOOTSTATUS:

> +static const struct file_operations wm8350_wdt_fops = {
> +	.owner = THIS_MODULE,
> +	.llseek = no_llseek,
> +	.write = wm8350_wdt_write,
> +	.ioctl = wm8350_wdt_ioctl,

and for the unlocked_ioctl call this needs to be:
	.unlocked_ioctl = wm8350_wdt_ioctl,

For the rest: seems OK to me.

Kind regards,
Wim.

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