linux-kernel - [PATCH 1/3] watchdog: wdat_wdg: Checking the module parameter timeout

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Message-Id: <1650668718-13626-1-git-send-email-liuxp11@chinatelecom.cn>
Date:   Sat, 23 Apr 2022 07:05:16 +0800
From:   Liu Xinpeng <liuxp11@...natelecom.cn>
To:     wim@...ux-watchdog.org, linux@...ck-us.net, groeck7@...il.com
Cc:     linux-watchdog@...r.kernel.org, linux-kernel@...r.kernel.org,
        Liu Xinpeng <liuxp11@...natelecom.cn>
Subject: [PATCH 1/3] watchdog: wdat_wdg: Checking the module parameter timeout

Setting up min_time, and determine if the timeout value is invalid
using the function watchdog_timeout_invalid.

Signed-off-by: Liu Xinpeng <liuxp11@...natelecom.cn>
---
 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..3040a0554055 100644
--- a/drivers/watchdog/wdat_wdt.c
+++ b/drivers/watchdog/wdat_wdt.c
@@ -14,6 +14,7 @@
 #include <linux/watchdog.h>
 
 #define MAX_WDAT_ACTIONS ACPI_WDAT_ACTION_RESERVED
+#define WDAT_TIMEOUT_MIN     1
 
 /**
  * struct wdat_instruction - Single ACPI WDAT instruction
@@ -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_TIMEOUT_MIN;
 	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