Commit 34ef4087 authored by Wolfram Sang's avatar Wolfram Sang Committed by Wim Van Sebroeck
Browse files

watchdog: refactor watchdog_init_timeout 



The function is not easy to read and has a problem: -EINVAL is returned
when the module parameter is invalid but the DT parameter is OK.

Refactor the code to have the same pattern of checks for the module
parameter and DT. Further ones can be easily added in the future if the
need arises. The above mentioned problem is fixed, too.

Some documentation is added to describe the different handlings of '0'
for the module parameter and the DT property.

Reviewed-by: default avatarGuenter Roeck <linux@roeck-us.net>
Signed-off-by: default avatarWolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: default avatarGuenter Roeck <linux@roeck-us.net>
Signed-off-by: default avatarWim Van Sebroeck <wim@linux-watchdog.org>
parent e1843126

drivers/watchdog/watchdog_core.c

+19 −14
Original line number Original line Diff line number Diff line
@@ -105,9 +105,12 @@ static void watchdog_check_min_max_timeout(struct watchdog_device *wdd) 
 * timeout module parameter (if it is valid value) or the timeout-sec property

 * timeout 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).

 * (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

 * If none of them are valid then we keep the old value (which should normally

 * be the default timeout value).

 * be the default timeout value). Note that for the module parameter, '0' means

 * 'use default' while it is an invalid value for the timeout-sec property.

 * It should simply be dropped if you want to use the default value then.

 *

 *

 * A zero is returned on success and -EINVAL for failure.

 * A zero is returned on success or -EINVAL if all provided values are out of

 * bounds.

 */

 */

int watchdog_init_timeout(struct watchdog_device *wdd,

int watchdog_init_timeout(struct watchdog_device *wdd,

				unsigned int timeout_parm, struct device *dev)

				unsigned int timeout_parm, struct device *dev)
@@ -117,22 +120,24 @@ int watchdog_init_timeout(struct watchdog_device *wdd, 




	watchdog_check_min_max_timeout(wdd);

	watchdog_check_min_max_timeout(wdd);





	/* try to get the timeout module parameter first */

	/* check the driver supplied value (likely a module parameter) first */

	if (!watchdog_timeout_invalid(wdd, timeout_parm) && timeout_parm) {

	if (timeout_parm) {

		if (!watchdog_timeout_invalid(wdd, timeout_parm)) {

			wdd->timeout = timeout_parm;

			wdd->timeout = timeout_parm;

		return ret;

			return 0;

		}

		}

	if (timeout_parm)

		ret = -EINVAL;

		ret = -EINVAL;

	}





	/* try to get the timeout_sec property */

	/* try to get the timeout_sec property */

	if (dev == NULL || dev->of_node == NULL)

	if (dev && dev->of_node &&

		return ret;

	    of_property_read_u32(dev->of_node, "timeout-sec", &t) == 0) {

	of_property_read_u32(dev->of_node, "timeout-sec", &t);

		if (t && !watchdog_timeout_invalid(wdd, t)) {

	if (!watchdog_timeout_invalid(wdd, t) && t)

			wdd->timeout = t;

			wdd->timeout = t;

	else

			return 0;

		}

		ret = -EINVAL;

		ret = -EINVAL;

	}





	return ret;

	return ret;

}

}

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