linux-kernel - [PATCH v4 1/4] watchdog: wdat_wdg: Using the existed function to check parameter timeout

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Message-Id: <1650957029-910-2-git-send-email-liuxp11@chinatelecom.cn>
Date:   Tue, 26 Apr 2022 15:10:26 +0800
From:   Liu Xinpeng <liuxp11@...natelecom.cn>
To:     wim@...ux-watchdog.org, linux@...ck-us.net, tzungbi@...nel.org
Cc:     linux-watchdog@...r.kernel.org, linux-kernel@...r.kernel.org,
        Liu Xinpeng <liuxp11@...natelecom.cn>
Subject: [PATCH v4 1/4] watchdog: wdat_wdg: Using the existed function to check parameter timeout

Context: If max_hw_heartbeat_ms is provided, the configured maximum timeout
is not limited by it. The limit check in this driver therefore doesn't make
much sense. Similar, the watchdog core ensures that minimum timeout limits
are met if min_hw_heartbeat_ms is set. Using watchdog_timeout_invalid()
makes more sense because it takes this into account.

Signed-off-by: Liu Xinpeng <liuxp11@...natelecom.cn>
Reviewed-by: Guenter Roeck <linux@...ck-us.net>
Reviewed-by: Tzung-Bi Shih <tzungbi@...nel.org>
---
 drivers/watchdog/wdat_wdt.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/watchdog/wdat_wdt.c b/drivers/watchdog/wdat_wdt.c
index 195c8c004b69..9db01d165310 100644
--- a/drivers/watchdog/wdat_wdt.c
+++ b/drivers/watchdog/wdat_wdt.c
@@ -55,6 +55,7 @@ MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
 		 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
 
 #define WDAT_DEFAULT_TIMEOUT	30
+#define WDAT_MIN_TIMEOUT     1
 
 static int timeout = WDAT_DEFAULT_TIMEOUT;
 module_param(timeout, int, 0);
@@ -344,6 +345,7 @@ static int wdat_wdt_probe(struct platform_device *pdev)
 	wdat->period = tbl->timer_period;
 	wdat->wdd.min_hw_heartbeat_ms = wdat->period * tbl->min_count;
 	wdat->wdd.max_hw_heartbeat_ms = wdat->period * tbl->max_count;
+	wdat->wdd.min_timeout = WDAT_MIN_TIMEOUT;
 	wdat->stopped_in_sleep = tbl->flags & ACPI_WDAT_STOPPED;
 	wdat->wdd.info = &wdat_wdt_info;
 	wdat->wdd.ops = &wdat_wdt_ops;
@@ -450,8 +452,7 @@ static int wdat_wdt_probe(struct platform_device *pdev)
 	 * watchdog properly after it has opened the device. In some cases
 	 * the BIOS default is too short and causes immediate reboot.
 	 */
-	if (timeout * 1000 < wdat->wdd.min_hw_heartbeat_ms ||
-	    timeout * 1000 > wdat->wdd.max_hw_heartbeat_ms) {
+	if (watchdog_timeout_invalid(&wdat->wdd, timeout)) {
 		dev_warn(dev, "Invalid timeout %d given, using %d\n",
 			 timeout, WDAT_DEFAULT_TIMEOUT);
 		timeout = WDAT_DEFAULT_TIMEOUT;
-- 
2.23.0