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: cphe...@gmail.com
Cc: linux-kernel@vger.kernel.org
Cc: Wim Van Sebroeck <w...@iguana.be>
Cc: Guenter Roeck <li...@roeck-us.net>
Cc: Andy Shevchenko <andy.shevche...@gmail.com>
Cc: Andrew Morton <a...@linux-foundation.org>
Signed-off-by: Andrey Smirnov <andrew.smir...@gmail.com>
Acked-by: Guenter Roeck <li...@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;
