[PATCH] wdog: imx-wd: watchdog cannot be disabled again

[Sascha Hauer]

On Thu, Nov 12, 2015 at 01:18:55PM +0100, Stefan Christ wrote:
> The i.MX21/i.MX6 watchdog cannot be disabled after it was activated.
> Bit 2 (WDE) cannot be set to 0 again. Notify the user about that by
> returning -ENOSYS.
> 
> Signed-off-by: Stefan Christ <s.christ at phytec.de>
> ---
>  drivers/watchdog/imxwd.c | 12 ++++++------
>  1 file changed, 6 insertions(+), 6 deletions(-)

Applied, thanks

Sascha

> 
> diff --git a/drivers/watchdog/imxwd.c b/drivers/watchdog/imxwd.c
> index dd11a62..bb0d2db 100644
> --- a/drivers/watchdog/imxwd.c
> +++ b/drivers/watchdog/imxwd.c
> @@ -97,14 +97,14 @@ static int imx21_watchdog_set_timeout(struct imx_wd *priv, int timeout)
>  
>  	dev_dbg(priv->dev, "%s: %d\n", __func__, timeout);
>  
> -	if (!timeout || timeout > 128)
> +	if (timeout < 0 || timeout > 128)
>  		return -EINVAL;
>  
> -	if (timeout > 0)
> -		val = ((timeout * 2 - 1) << 8) | IMX21_WDOG_WCR_SRS |
> -			IMX21_WDOG_WCR_WDA;
> -	else
> -		val = 0;
> +	if (timeout == 0) /* bit 2 (WDE) cannot be set to 0 again */
> +		return -ENOSYS;
> +
> +	val = ((timeout * 2 - 1) << 8) | IMX21_WDOG_WCR_SRS |
> +		IMX21_WDOG_WCR_WDA;
>  
>  	writew(val, priv->base + IMX21_WDOG_WCR);
>  	writew(IMX21_WDOG_WCR_WDE | val, priv->base + IMX21_WDOG_WCR);
> -- 
> 1.9.1
> 
> 
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