From 34ef4087a1d50f5481732ad85544362516e8185f Mon Sep 17 00:00:00 2001 From: Wolfram Sang Date: Fri, 19 Apr 2019 20:15:46 +0200 Subject: 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: Guenter Roeck Signed-off-by: Wolfram Sang Signed-off-by: Guenter Roeck Signed-off-by: Wim Van Sebroeck --- drivers/watchdog/watchdog_core.c | 33 +++++++++++++++++++-------------- 1 file changed, 19 insertions(+), 14 deletions(-) (limited to 'drivers/watchdog/watchdog_core.c') diff --git a/drivers/watchdog/watchdog_core.c b/drivers/watchdog/watchdog_core.c index eb8fa25f8eb2..21e53cc49977 100644 --- a/drivers/watchdog/watchdog_core.c +++ b/drivers/watchdog/watchdog_core.c @@ -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 * (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 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, 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); - /* try to get the timeout module parameter first */ - if (!watchdog_timeout_invalid(wdd, timeout_parm) && timeout_parm) { - wdd->timeout = timeout_parm; - return ret; - } - if (timeout_parm) + /* check the driver supplied value (likely a module parameter) first */ + if (timeout_parm) { + if (!watchdog_timeout_invalid(wdd, timeout_parm)) { + wdd->timeout = timeout_parm; + return 0; + } ret = -EINVAL; + } /* try to get the timeout_sec property */ - if (dev == NULL || dev->of_node == NULL) - return ret; - of_property_read_u32(dev->of_node, "timeout-sec", &t); - if (!watchdog_timeout_invalid(wdd, t) && t) - wdd->timeout = t; - else + if (dev && dev->of_node && + of_property_read_u32(dev->of_node, "timeout-sec", &t) == 0) { + if (t && !watchdog_timeout_invalid(wdd, t)) { + wdd->timeout = t; + return 0; + } ret = -EINVAL; + } return ret; } -- cgit