Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1621440 > unrolled thread

[PATCH v2] watchdog: core: Make use of devm_register_reboot_notifier()

Back to article view | Back to linux.kernel

Contents

  [PATCH v2] watchdog: core: Make use of devm_register_reboot_notifier() Andrey Smirnov <andrew.smirnov@gmail.com> - 2017-04-11 18:10 +0200
    Re: [PATCH v2] watchdog: core: Make use of  devm_register_reboot_notifier() Guenter Roeck <linux@roeck-us.net> - 2017-04-16 08:20 +0200

#1621440 — [PATCH v2] watchdog: core: Make use of devm_register_reboot_notifier()

Save a bit of cleanup code by leveraging newly added
devm_register_reboot_notifier().

Cc: cphealy@gmail.com
Cc: linux-kernel@vger.kernel.org
Cc: Wim Van Sebroeck <wim@iguana.be>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
---

Guenter, Andy:

Here's the second version of the patch originally submitted in
[v1]. This time I tried to follow Guenter's suggestion of moving this
bit on initialization in watchdog_dev_register().

If I missed something obvious why this patch wouldn't work, again,
please let me know.

Patch introducting devm_register_reboot_notifier() can be found in
[other-patch]

Thanks,
Andrey Smirnov

[v1] https://lkml.org/lkml/2017/4/4/388
[other-patch] https://lkml.org/lkml/2017/3/20/671


 drivers/watchdog/watchdog_core.c | 35 -----------------------------------
 drivers/watchdog/watchdog_dev.c  | 32 ++++++++++++++++++++++++++++++++
 2 files changed, 32 insertions(+), 35 deletions(-)

diff --git a/drivers/watchdog/watchdog_core.c b/drivers/watchdog/watchdog_core.c
index 74265b2..8a8d952 100644
--- a/drivers/watchdog/watchdog_core.c
+++ b/drivers/watchdog/watchdog_core.c
@@ -137,25 +137,6 @@ int watchdog_init_timeout(struct watchdog_device *wdd,
 }
 EXPORT_SYMBOL_GPL(watchdog_init_timeout);
 
-static int watchdog_reboot_notifier(struct notifier_block *nb,
-				    unsigned long code, void *data)
-{
-	struct watchdog_device *wdd = container_of(nb, struct watchdog_device,
-						   reboot_nb);
-
-	if (code == SYS_DOWN || code == SYS_HALT) {
-		if (watchdog_active(wdd)) {
-			int ret;
-
-			ret = wdd->ops->stop(wdd);
-			if (ret)
-				return NOTIFY_BAD;
-		}
-	}
-
-	return NOTIFY_DONE;
-}
-
 static int watchdog_restart_notifier(struct notifier_block *nb,
 				     unsigned long action, void *data)
 {
@@ -244,19 +225,6 @@ static int __watchdog_register_device(struct watchdog_device *wdd)
 		}
 	}
 
-	if (test_bit(WDOG_STOP_ON_REBOOT, &wdd->status)) {
-		wdd->reboot_nb.notifier_call = watchdog_reboot_notifier;
-
-		ret = register_reboot_notifier(&wdd->reboot_nb);
-		if (ret) {
-			pr_err("watchdog%d: Cannot register reboot notifier (%d)\n",
-			       wdd->id, ret);
-			watchdog_dev_unregister(wdd);
-			ida_simple_remove(&watchdog_ida, wdd->id);
-			return ret;
-		}
-	}
-
 	if (wdd->ops->restart) {
 		wdd->restart_nb.notifier_call = watchdog_restart_notifier;
 
@@ -302,9 +270,6 @@ static void __watchdog_unregister_device(struct watchdog_device *wdd)
 	if (wdd->ops->restart)
 		unregister_restart_handler(&wdd->restart_nb);
 
-	if (test_bit(WDOG_STOP_ON_REBOOT, &wdd->status))
-		unregister_reboot_notifier(&wdd->reboot_nb);
-
 	watchdog_dev_unregister(wdd);
 	ida_simple_remove(&watchdog_ida, wdd->id);
 }
diff --git a/drivers/watchdog/watchdog_dev.c b/drivers/watchdog/watchdog_dev.c
index 32930a0..9a52990 100644
--- a/drivers/watchdog/watchdog_dev.c
+++ b/drivers/watchdog/watchdog_dev.c
@@ -42,6 +42,7 @@
 #include <linux/miscdevice.h>	/* For handling misc devices */
 #include <linux/module.h>	/* For module stuff/... */
 #include <linux/mutex.h>	/* For mutexes */
+#include <linux/reboot.h>	/* For reboot notifier */
 #include <linux/slab.h>		/* For memory functions */
 #include <linux/types.h>	/* For standard types (like size_t) */
 #include <linux/watchdog.h>	/* For watchdog specific items */
@@ -998,6 +999,25 @@ static struct class watchdog_class = {
 	.dev_groups =	wdt_groups,
 };
 
+static int watchdog_reboot_notifier(struct notifier_block *nb,
+				    unsigned long code, void *data)
+{
+	struct watchdog_device *wdd = container_of(nb, struct watchdog_device,
+						   reboot_nb);
+
+	if (code == SYS_DOWN || code == SYS_HALT) {
+		if (watchdog_active(wdd)) {
+			int ret;
+
+			ret = wdd->ops->stop(wdd);
+			if (ret)
+				return NOTIFY_BAD;
+		}
+	}
+
+	return NOTIFY_DONE;
+}
+
 /*
  *	watchdog_dev_register: register a watchdog device
  *	@wdd: watchdog device
@@ -1031,6 +1051,18 @@ int watchdog_dev_register(struct watchdog_device *wdd)
 	if (ret) {
 		device_destroy(&watchdog_class, devno);
 		watchdog_cdev_unregister(wdd);
+		return ret;
+	}
+
+	if (test_bit(WDOG_STOP_ON_REBOOT, &wdd->status)) {
+		wdd->reboot_nb.notifier_call = watchdog_reboot_notifier;
+
+		ret = devm_register_reboot_notifier(dev, &wdd->reboot_nb);
+		if (ret) {
+			pr_err("watchdog%d: Cannot register reboot notifier (%d)\n",
+			       wdd->id, ret);
+			watchdog_dev_unregister(wdd);
+		}
 	}
 
 	return ret;
-- 
2.9.3

[toc] | [next] | [standalone]

#1624162 — Re: [PATCH v2] watchdog: core: Make use of devm_register_reboot_notifier()

On 04/11/2017 09:06 AM, Andrey Smirnov wrote:
> Save a bit of cleanup code by leveraging newly added
> devm_register_reboot_notifier().
>
> Cc: cphealy@gmail.com
> Cc: linux-kernel@vger.kernel.org
> Cc: Wim Van Sebroeck <wim@iguana.be>
> Cc: Guenter Roeck <linux@roeck-us.net>
> Cc: Andy Shevchenko <andy.shevchenko@gmail.com>
> Cc: Andrew Morton <akpm@linux-foundation.org>
> Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>

Acked-by: Guenter Roeck <linux@roeck-us.net>

> ---
>
> Guenter, Andy:
>
> Here's the second version of the patch originally submitted in
> [v1]. This time I tried to follow Guenter's suggestion of moving this
> bit on initialization in watchdog_dev_register().
>
> If I missed something obvious why this patch wouldn't work, again,
> please let me know.
>
> Patch introducting devm_register_reboot_notifier() can be found in
> [other-patch]
>
> Thanks,
> Andrey Smirnov
>
> [v1] https://lkml.org/lkml/2017/4/4/388
> [other-patch] https://lkml.org/lkml/2017/3/20/671
>
>
>  drivers/watchdog/watchdog_core.c | 35 -----------------------------------
>  drivers/watchdog/watchdog_dev.c  | 32 ++++++++++++++++++++++++++++++++
>  2 files changed, 32 insertions(+), 35 deletions(-)
>
> diff --git a/drivers/watchdog/watchdog_core.c b/drivers/watchdog/watchdog_core.c
> index 74265b2..8a8d952 100644
> --- a/drivers/watchdog/watchdog_core.c
> +++ b/drivers/watchdog/watchdog_core.c
> @@ -137,25 +137,6 @@ int watchdog_init_timeout(struct watchdog_device *wdd,
>  }
>  EXPORT_SYMBOL_GPL(watchdog_init_timeout);
>
> -static int watchdog_reboot_notifier(struct notifier_block *nb,
> -				    unsigned long code, void *data)
> -{
> -	struct watchdog_device *wdd = container_of(nb, struct watchdog_device,
> -						   reboot_nb);
> -
> -	if (code == SYS_DOWN || code == SYS_HALT) {
> -		if (watchdog_active(wdd)) {
> -			int ret;
> -
> -			ret = wdd->ops->stop(wdd);
> -			if (ret)
> -				return NOTIFY_BAD;
> -		}
> -	}
> -
> -	return NOTIFY_DONE;
> -}
> -
>  static int watchdog_restart_notifier(struct notifier_block *nb,
>  				     unsigned long action, void *data)
>  {
> @@ -244,19 +225,6 @@ static int __watchdog_register_device(struct watchdog_device *wdd)
>  		}
>  	}
>
> -	if (test_bit(WDOG_STOP_ON_REBOOT, &wdd->status)) {
> -		wdd->reboot_nb.notifier_call = watchdog_reboot_notifier;
> -
> -		ret = register_reboot_notifier(&wdd->reboot_nb);
> -		if (ret) {
> -			pr_err("watchdog%d: Cannot register reboot notifier (%d)\n",
> -			       wdd->id, ret);
> -			watchdog_dev_unregister(wdd);
> -			ida_simple_remove(&watchdog_ida, wdd->id);
> -			return ret;
> -		}
> -	}
> -
>  	if (wdd->ops->restart) {
>  		wdd->restart_nb.notifier_call = watchdog_restart_notifier;
>
> @@ -302,9 +270,6 @@ static void __watchdog_unregister_device(struct watchdog_device *wdd)
>  	if (wdd->ops->restart)
>  		unregister_restart_handler(&wdd->restart_nb);
>
> -	if (test_bit(WDOG_STOP_ON_REBOOT, &wdd->status))
> -		unregister_reboot_notifier(&wdd->reboot_nb);
> -
>  	watchdog_dev_unregister(wdd);
>  	ida_simple_remove(&watchdog_ida, wdd->id);
>  }
> diff --git a/drivers/watchdog/watchdog_dev.c b/drivers/watchdog/watchdog_dev.c
> index 32930a0..9a52990 100644
> --- a/drivers/watchdog/watchdog_dev.c
> +++ b/drivers/watchdog/watchdog_dev.c
> @@ -42,6 +42,7 @@
>  #include <linux/miscdevice.h>	/* For handling misc devices */
>  #include <linux/module.h>	/* For module stuff/... */
>  #include <linux/mutex.h>	/* For mutexes */
> +#include <linux/reboot.h>	/* For reboot notifier */
>  #include <linux/slab.h>		/* For memory functions */
>  #include <linux/types.h>	/* For standard types (like size_t) */
>  #include <linux/watchdog.h>	/* For watchdog specific items */
> @@ -998,6 +999,25 @@ static struct class watchdog_class = {
>  	.dev_groups =	wdt_groups,
>  };
>
> +static int watchdog_reboot_notifier(struct notifier_block *nb,
> +				    unsigned long code, void *data)
> +{
> +	struct watchdog_device *wdd = container_of(nb, struct watchdog_device,
> +						   reboot_nb);
> +
> +	if (code == SYS_DOWN || code == SYS_HALT) {
> +		if (watchdog_active(wdd)) {
> +			int ret;
> +
> +			ret = wdd->ops->stop(wdd);
> +			if (ret)
> +				return NOTIFY_BAD;
> +		}
> +	}
> +
> +	return NOTIFY_DONE;
> +}
> +
>  /*
>   *	watchdog_dev_register: register a watchdog device
>   *	@wdd: watchdog device
> @@ -1031,6 +1051,18 @@ int watchdog_dev_register(struct watchdog_device *wdd)
>  	if (ret) {
>  		device_destroy(&watchdog_class, devno);
>  		watchdog_cdev_unregister(wdd);
> +		return ret;
> +	}
> +
> +	if (test_bit(WDOG_STOP_ON_REBOOT, &wdd->status)) {
> +		wdd->reboot_nb.notifier_call = watchdog_reboot_notifier;
> +
> +		ret = devm_register_reboot_notifier(dev, &wdd->reboot_nb);
> +		if (ret) {
> +			pr_err("watchdog%d: Cannot register reboot notifier (%d)\n",
> +			       wdd->id, ret);
> +			watchdog_dev_unregister(wdd);
> +		}
>  	}
>
>  	return ret;
>

[toc] | [prev] | [standalone]

Back to top | Article view | linux.kernel

csiph-web