github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-09-24 06:24:02 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

watchdog: rzv2h: Avoid division by zero

Browse Source 
clk_get_rate() could return 0.  Avoid a division by zero panic.

Fixes: f6febd0a30 ("watchdog: Add Watchdog Timer driver for RZ/V2H(P)")
Cc: stable@vger.kernel.org
Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org>
Link: https://patch.msgid.link/20260913064851.8239-4-tzungbi@kernel.org
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Tzung-Bi Shih 2026-09-13 14:48:51 +08:00 committed by Guenter Roeck
parent 5af7d2cbd2
commit 6274281c41
1 changed files with 6 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
drivers/watchdog/rzv2h_wdt.c
View File

@ -278,6 +278,7 @@ static int rzv2h_wdt_probe(struct platform_device *pdev)
struct device *dev = &pdev->dev;
struct rzv2h_wdt_priv *priv;
struct clk *count_clk;
unsigned long rate;
int ret;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
@ -314,8 +315,12 @@ static int rzv2h_wdt_probe(struct platform_device *pdev)
return dev_err_probe(dev, -EINVAL, "Invalid count source\n");
}
rate = clk_get_rate(count_clk);
if (!rate)
return dev_err_probe(dev, -EINVAL, "Invalid clock rate\n");
priv->wdev.max_hw_heartbeat_ms = (MILLI * priv->of_data->timeout_cycles *
priv->of_data->cks_div) / clk_get_rate(count_clk);
priv->of_data->cks_div) / rate;
dev_dbg(dev, "max hw timeout of %dms\n", priv->wdev.max_hw_heartbeat_ms);
ret = devm_pm_runtime_enable(dev);