diff options
Diffstat (limited to 'target/linux/ipq806x/patches-4.4/009-2-watchdog-core-add-reboot-notifier-support.patch')
-rw-r--r-- | target/linux/ipq806x/patches-4.4/009-2-watchdog-core-add-reboot-notifier-support.patch | 160 |
1 files changed, 0 insertions, 160 deletions
diff --git a/target/linux/ipq806x/patches-4.4/009-2-watchdog-core-add-reboot-notifier-support.patch b/target/linux/ipq806x/patches-4.4/009-2-watchdog-core-add-reboot-notifier-support.patch deleted file mode 100644 index 2afa4e566b..0000000000 --- a/target/linux/ipq806x/patches-4.4/009-2-watchdog-core-add-reboot-notifier-support.patch +++ /dev/null @@ -1,160 +0,0 @@ -From e131319669e0ef5e6fcd75174daeffa40492135c Mon Sep 17 00:00:00 2001 -From: Damien Riegel <damien.riegel@savoirfairelinux.com> -Date: Fri, 20 Nov 2015 16:54:51 -0500 -Subject: watchdog: core: add reboot notifier support - -Many watchdog drivers register a reboot notifier in order to stop the -watchdog on system reboot. Thus we can factorize this code in the -watchdog core. - -For that purpose, a new notifier block is added in watchdog_device for -internal use only, as well as a new watchdog_stop_on_reboot helper -function. - -If this helper is called, watchdog core registers the related notifier -block and will stop the watchdog when SYS_HALT or SYS_DOWN is received. - -Since this operation can be critical on some platforms, abort the device -registration if the reboot notifier registration fails. - -Suggested-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com> -Signed-off-by: Damien Riegel <damien.riegel@savoirfairelinux.com> -Reviewed-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com> -Signed-off-by: Guenter Roeck <linux@roeck-us.net> -Signed-off-by: Wim Van Sebroeck <wim@iguana.be> ---- - Documentation/watchdog/watchdog-kernel-api.txt | 8 ++++++ - drivers/watchdog/watchdog_core.c | 37 ++++++++++++++++++++++++++ - include/linux/watchdog.h | 9 +++++++ - 3 files changed, 54 insertions(+) - ---- a/Documentation/watchdog/watchdog-kernel-api.txt -+++ b/Documentation/watchdog/watchdog-kernel-api.txt -@@ -53,6 +53,7 @@ struct watchdog_device { - unsigned int timeout; - unsigned int min_timeout; - unsigned int max_timeout; -+ struct notifier_block reboot_nb; - struct notifier_block restart_nb; - void *driver_data; - struct mutex lock; -@@ -76,6 +77,9 @@ It contains following fields: - * timeout: the watchdog timer's timeout value (in seconds). - * min_timeout: the watchdog timer's minimum timeout value (in seconds). - * max_timeout: the watchdog timer's maximum timeout value (in seconds). -+* reboot_nb: notifier block that is registered for reboot notifications, for -+ internal use only. If the driver calls watchdog_stop_on_reboot, watchdog core -+ will stop the watchdog on such notifications. - * restart_nb: notifier block that is registered for machine restart, for - internal use only. If a watchdog is capable of restarting the machine, it - should define ops->restart. Priority can be changed through -@@ -240,6 +244,10 @@ to set the default timeout value as time - then use this function to set the user "preferred" timeout value. - This routine returns zero on success and a negative errno code for failure. - -+To disable the watchdog on reboot, the user must call the following helper: -+ -+static inline void watchdog_stop_on_reboot(struct watchdog_device *wdd); -+ - To change the priority of the restart handler the following helper should be - used: - ---- a/drivers/watchdog/watchdog_core.c -+++ b/drivers/watchdog/watchdog_core.c -@@ -138,6 +138,25 @@ int watchdog_init_timeout(struct watchdo - } - 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) - { -@@ -238,6 +257,21 @@ static int __watchdog_register_device(st - return ret; - } - -+ 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) { -+ dev_err(wdd->dev, "Cannot register reboot notifier (%d)\n", -+ ret); -+ watchdog_dev_unregister(wdd); -+ device_destroy(watchdog_class, devno); -+ ida_simple_remove(&watchdog_ida, wdd->id); -+ wdd->dev = NULL; -+ return ret; -+ } -+ } -+ - if (wdd->ops->restart) { - wdd->restart_nb.notifier_call = watchdog_restart_notifier; - -@@ -286,6 +320,9 @@ static void __watchdog_unregister_device - 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); -+ - devno = wdd->cdev.dev; - ret = watchdog_dev_unregister(wdd); - if (ret) ---- a/include/linux/watchdog.h -+++ b/include/linux/watchdog.h -@@ -65,6 +65,7 @@ struct watchdog_ops { - * @timeout: The watchdog devices timeout value (in seconds). - * @min_timeout:The watchdog devices minimum timeout value (in seconds). - * @max_timeout:The watchdog devices maximum timeout value (in seconds). -+ * @reboot_nb: The notifier block to stop watchdog on reboot. - * @restart_nb: The notifier block to register a restart function. - * @driver-data:Pointer to the drivers private data. - * @lock: Lock for watchdog core internal use only. -@@ -92,6 +93,7 @@ struct watchdog_device { - unsigned int timeout; - unsigned int min_timeout; - unsigned int max_timeout; -+ struct notifier_block reboot_nb; - struct notifier_block restart_nb; - void *driver_data; - struct mutex lock; -@@ -102,6 +104,7 @@ struct watchdog_device { - #define WDOG_ALLOW_RELEASE 2 /* Did we receive the magic char ? */ - #define WDOG_NO_WAY_OUT 3 /* Is 'nowayout' feature set ? */ - #define WDOG_UNREGISTERED 4 /* Has the device been unregistered */ -+#define WDOG_STOP_ON_REBOOT 5 /* Should be stopped on reboot */ - struct list_head deferred; - }; - -@@ -121,6 +124,12 @@ static inline void watchdog_set_nowayout - set_bit(WDOG_NO_WAY_OUT, &wdd->status); - } - -+/* Use the following function to stop the watchdog on reboot */ -+static inline void watchdog_stop_on_reboot(struct watchdog_device *wdd) -+{ -+ set_bit(WDOG_STOP_ON_REBOOT, &wdd->status); -+} -+ - /* Use the following function to check if a timeout value is invalid */ - static inline bool watchdog_timeout_invalid(struct watchdog_device *wdd, unsigned int t) - { |