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[v3,2/5] watchdog: s3c2410_wdt: Fix max_timeout being calculated larger

Message ID 20250515075350.3368635-3-sw617.shin@samsung.com
State Superseded
Headers show
Series Increase max timeout value of s3c2410 watchdog | expand

Commit Message

Sangwook Shin May 15, 2025, 7:53 a.m. UTC 
Fix the issue of max_timeout being calculated larger than actual value.
The calculation result of freq / (S3C2410_WTCON_PRESCALE_MAX + 1) /
S3C2410_WTCON_MAXDIV is smaller than the actual value because the remainder
is discarded during the calculation process. This leads to a larger
calculated value for max_timeout compared to the actual settable value.
A ceiling operation is applied in the calculation process to resolve this.

Signed-off-by: Sangwook Shin <sw617.shin@samsung.com>
---
 drivers/watchdog/s3c2410_wdt.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
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Patch

diff --git a/drivers/watchdog/s3c2410_wdt.c b/drivers/watchdog/s3c2410_wdt.c
index 228f86d83663..c6166d927155 100644
--- a/drivers/watchdog/s3c2410_wdt.c
+++ b/drivers/watchdog/s3c2410_wdt.c
@@ -379,8 +379,8 @@  static inline unsigned int s3c2410wdt_max_timeout(struct s3c2410_wdt *wdt)
 {
 	const unsigned long freq = s3c2410wdt_get_freq(wdt);
 
-	return S3C2410_WTCNT_MAXCNT / (freq / (S3C2410_WTCON_PRESCALE_MAX + 1)
-				       / S3C2410_WTCON_MAXDIV);
+	return S3C2410_WTCNT_MAXCNT / DIV_ROUND_UP(freq,
+		(S3C2410_WTCON_PRESCALE_MAX + 1) * S3C2410_WTCON_MAXDIV);
 }
 
 static int s3c2410wdt_disable_wdt_reset(struct s3c2410_wdt *wdt, bool mask)