From: Matti Vaittinen mazziesaccount@gmail.com
stable inclusion from stable-v6.6.33 commit d47f51eb1fc36b39245236d53a7f4c72acbc4caf category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/IAD6H2
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
--------------------------------
[ Upstream commit e3b3afd34d84efcbe4543deb966b1990f43584b8 ]
The always-running (from linux,wdt-gpio.yaml) is abused by the BD9576 watchdog driver. It's defined meaning is "the watchdog is always running and can not be stopped". The BD9576 watchdog driver has implemented it as "start watchdog when loading the module and prevent it from being stopped".
Furthermore, the implementation does not set the WDOG_HW_RUNNING when enabling the watchdog due to the "always-running" at module loading. This will end up resulting a watchdog timeout if the device is not opened.
The culprit was pointed out by Guenter, discussion can be found from https://lore.kernel.org/lkml/4fa3a64b-60fb-4e5e-8785-0f14da37eea2@roeck-us.n...
Drop the invalid "always-running" handling.
Signed-off-by: Matti Vaittinen mazziesaccount@gmail.com Reported-by: Guenter Roeck linux@roeck-us.net Fixes: b237bcac557a ("wdt: Support wdt on ROHM BD9576MUF and BD9573MUF") Reviewed-by: Guenter Roeck linux@roeck-us.net Link: https://lore.kernel.org/r/ZhPAt76yaJMersXf@fedora Signed-off-by: Guenter Roeck linux@roeck-us.net Signed-off-by: Wim Van Sebroeck wim@linux-watchdog.org Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Wang Hai wanghai38@huawei.com --- drivers/watchdog/bd9576_wdt.c | 12 +----------- 1 file changed, 1 insertion(+), 11 deletions(-)
diff --git a/drivers/watchdog/bd9576_wdt.c b/drivers/watchdog/bd9576_wdt.c index 4a20e07fbb69..f00ea1b4e40b 100644 --- a/drivers/watchdog/bd9576_wdt.c +++ b/drivers/watchdog/bd9576_wdt.c @@ -29,7 +29,6 @@ struct bd9576_wdt_priv { struct gpio_desc *gpiod_en; struct device *dev; struct regmap *regmap; - bool always_running; struct watchdog_device wdd; };
@@ -62,10 +61,7 @@ static int bd9576_wdt_stop(struct watchdog_device *wdd) { struct bd9576_wdt_priv *priv = watchdog_get_drvdata(wdd);
- if (!priv->always_running) - bd9576_wdt_disable(priv); - else - set_bit(WDOG_HW_RUNNING, &wdd->status); + bd9576_wdt_disable(priv);
return 0; } @@ -264,9 +260,6 @@ static int bd9576_wdt_probe(struct platform_device *pdev) if (ret) return ret;
- priv->always_running = device_property_read_bool(dev->parent, - "always-running"); - watchdog_set_drvdata(&priv->wdd, priv);
priv->wdd.info = &bd957x_wdt_ident; @@ -281,9 +274,6 @@ static int bd9576_wdt_probe(struct platform_device *pdev)
watchdog_stop_on_reboot(&priv->wdd);
- if (priv->always_running) - bd9576_wdt_start(&priv->wdd); - return devm_watchdog_register_device(dev, &priv->wdd); }