On Friday 15 May 2015 19:24:48 fu.wei@xxxxxxxxxx wrote:
> +static void watchdog_check_min_max_pretimeout(struct watchdog_device *wdd)
> +{
> + /*
> + * Check that we have valid min and max pretimeout values, if
> + * not reset them both to 0 (=not used or unknown)
> + */
> + if (wdd->min_pretimeout > wdd->max_pretimeout) {
> + pr_info("Invalid min and max pretimeout, resetting to 0!\n");
> + wdd->min_pretimeout = 0;
> + wdd->max_pretimeout = 0;
> + }
> +}
I would probably just fold this function into the existing
watchdog_check_min_max_timeout() and check both normal and pre-timeout
there.
> +/**
> + * watchdog_init_pretimeout() - initialize the pretimeout field
> + * @pretimeout_parm: pretimeout module parameter
> + * @dev: Device that stores the timeout-sec property
> + *
> + * Initialize the pretimeout field of the watchdog_device struct with either
> + * the pretimeout module parameter (if it is valid value) or the timeout-sec
> + * property (only if it is a valid value and the timeout_parm is out of bounds).
> + * If none of them are valid then we keep the old value (which should normally
> + * be the default pretimeout value.
> + *
> + * A zero is returned on success and -EINVAL for failure.
> + */
> +int watchdog_init_pretimeout(struct watchdog_device *wdd,
> + unsigned int pretimeout_parm, struct device *dev)
> +{
> + int ret = 0;
> + u32 timeouts[2];
> +
> + watchdog_check_min_max_pretimeout(wdd);
> +
> + /* try to get the timeout module parameter first */
> + if (!watchdog_pretimeout_invalid(wdd, pretimeout_parm) &&
> + pretimeout_parm) {
> + wdd->pretimeout = pretimeout_parm;
> + return ret;
> + }
> + if (pretimeout_parm)
> + ret = -EINVAL;
> +
> + /* try to get the timeout_sec property */
> + if (!dev || !dev->of_node)
> + return ret;
> + ret = of_property_read_u32_array(dev->of_node,
> + "timeout-sec", timeouts, 2);
> + if (!watchdog_pretimeout_invalid(wdd, timeouts[1]) && timeouts[1])
> + wdd->pretimeout = timeouts[1];
> + else
> + ret = -EINVAL;
> +
> + return ret;
> +}
> +EXPORT_SYMBOL_GPL(watchdog_init_pretimeout);
Same here: the function is very similar to the watchdog_init_timeout
function, and it reads the same property, so just do both here.
The easiest way for that is probably to use of_find_property()
and of_prop_next_u32() to read the two numbers.
Arnd
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