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authorWolfram Sang <wsa+renesas@sang-engineering.com>2017-07-19 10:27:52 +0200
committerWim Van Sebroeck <wim@iguana.be>2017-09-09 20:23:08 +0200
commitb51247c8029660a9c49ad48bf38f364479c96215 (patch)
treeb6c6025459a2eb99400df22036aae62f4dfa7eda /drivers/watchdog
parentf6159dd4b085ad839ab02c1ba230535c53ef60d4 (diff)
downloadlinux-b51247c8029660a9c49ad48bf38f364479c96215.tar.bz2
watchdog: renesas_wdt: check rate also for upper limit
When checking the clock rate, ensure also that counting all 16 bits takes at least one second to match the granularity of the framework. Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
Diffstat (limited to 'drivers/watchdog')
-rw-r--r--drivers/watchdog/renesas_wdt.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/watchdog/renesas_wdt.c b/drivers/watchdog/renesas_wdt.c
index 22b0348826de..8437dd521532 100644
--- a/drivers/watchdog/renesas_wdt.c
+++ b/drivers/watchdog/renesas_wdt.c
@@ -134,14 +134,14 @@ static int rwdt_probe(struct platform_device *pdev)
for (i = ARRAY_SIZE(clk_divs) - 1; i >= 0; i--) {
clks_per_sec = DIV_ROUND_UP(rate, clk_divs[i]);
- if (clks_per_sec) {
+ if (clks_per_sec && clks_per_sec < 65536) {
priv->clks_per_sec = clks_per_sec;
priv->cks = i;
break;
}
}
- if (!clks_per_sec) {
+ if (i < 0) {
dev_err(&pdev->dev, "Can't find suitable clock divider\n");
return -ERANGE;
}