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author | Guenter Roeck <linux@roeck-us.net> | 2014-09-26 00:03:17 +0000 |
---|---|---|
committer | Guenter Roeck <linux@roeck-us.net> | 2014-09-26 00:00:32 -0700 |
commit | 87ffc69e4b05f6e98e2b7a42f23132ed3662450a (patch) | |
tree | e77c6bc25e82294c898db6a6931366a1cdeaa725 | |
parent | ad0e0e6810b339ddeb97ab9ae24e996db5c11bac (diff) | |
download | linux-stable-87ffc69e4b05f6e98e2b7a42f23132ed3662450a.tar.gz linux-stable-87ffc69e4b05f6e98e2b7a42f23132ed3662450a.tar.bz2 linux-stable-87ffc69e4b05f6e98e2b7a42f23132ed3662450a.zip |
watchdog: alim7101: register restart handler with kernel restart handler
The kernel core now provides an API to trigger a system restart. Register
with it to restart the system instead of misusing the reboot notifier.
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Heiko Stuebner <heiko@sntech.de>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jonas Jensen <jonas.jensen@gmail.com>
Cc: Maxime Ripard <maxime.ripard@free-electrons.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Tomasz Figa <t.figa@samsung.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Wim Van Sebroeck <wim@iguana.be>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
-rw-r--r-- | drivers/watchdog/alim7101_wdt.c | 42 |
1 files changed, 32 insertions, 10 deletions
diff --git a/drivers/watchdog/alim7101_wdt.c b/drivers/watchdog/alim7101_wdt.c index 996b2f7d330e..665e0e7dfe1e 100644 --- a/drivers/watchdog/alim7101_wdt.c +++ b/drivers/watchdog/alim7101_wdt.c @@ -301,6 +301,28 @@ static struct miscdevice wdt_miscdev = { .fops = &wdt_fops, }; +static int wdt_restart_handle(struct notifier_block *this, unsigned long mode, + void *cmd) +{ + /* + * Cobalt devices have no way of rebooting themselves other + * than getting the watchdog to pull reset, so we restart the + * watchdog on reboot with no heartbeat. + */ + wdt_change(WDT_ENABLE); + + /* loop until the watchdog fires */ + while (true) + ; + + return NOTIFY_DONE; +} + +static struct notifier_block wdt_restart_handler = { + .notifier_call = wdt_restart_handle, + .priority = 128, +}; + /* * Notifier for system down */ @@ -311,15 +333,6 @@ static int wdt_notify_sys(struct notifier_block *this, if (code == SYS_DOWN || code == SYS_HALT) wdt_turnoff(); - if (code == SYS_RESTART) { - /* - * Cobalt devices have no way of rebooting themselves other - * than getting the watchdog to pull reset, so we restart the - * watchdog on reboot with no heartbeat - */ - wdt_change(WDT_ENABLE); - pr_info("Watchdog timer is now enabled with no heartbeat - should reboot in ~1 second\n"); - } return NOTIFY_DONE; } @@ -338,6 +351,7 @@ static void __exit alim7101_wdt_unload(void) /* Deregister */ misc_deregister(&wdt_miscdev); unregister_reboot_notifier(&wdt_notifier); + unregister_restart_handler(&wdt_restart_handler); pci_dev_put(alim7101_pmu); } @@ -390,11 +404,17 @@ static int __init alim7101_wdt_init(void) goto err_out; } + rc = register_restart_handler(&wdt_restart_handler); + if (rc) { + pr_err("cannot register restart handler (err=%d)\n", rc); + goto err_out_reboot; + } + rc = misc_register(&wdt_miscdev); if (rc) { pr_err("cannot register miscdev on minor=%d (err=%d)\n", wdt_miscdev.minor, rc); - goto err_out_reboot; + goto err_out_restart; } if (nowayout) @@ -404,6 +424,8 @@ static int __init alim7101_wdt_init(void) timeout, nowayout); return 0; +err_out_restart: + unregister_restart_handler(&wdt_restart_handler); err_out_reboot: unregister_reboot_notifier(&wdt_notifier); err_out: |