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| author | Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com> | 2016-10-07 14:39:56 +0200 |
|---|---|---|
| committer | Wim Van Sebroeck <wim@iguana.be> | 2016-10-08 10:27:17 +0200 |
| commit | da0d12ff2b829a35e9921918e925d79497b82bef (patch) | |
| tree | 6c72ee5f9d3b26a9cb23baed655545b52559aba4 /drivers/watchdog/watchdog_pretimeout.c | |
| parent | watchdog: pretimeout: add noop pretimeout governor (diff) | |
| download | linux-da0d12ff2b829a35e9921918e925d79497b82bef.tar.xz linux-da0d12ff2b829a35e9921918e925d79497b82bef.zip | |
watchdog: pretimeout: add panic pretimeout governor
The change adds panic watchdog pretimeout governor, on watchdog
pretimeout event the kernel shall panic. In general watchdog
pretimeout event means that something essentially bad is going on the
system, for example a process scheduler stalls or watchdog feeder is
killed due to OOM, so printing out information attendant to panic and
before likely unavoidable reboot caused by a watchdog may help to
determine a root cause of the issue.
Signed-off-by: Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Tested-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
Diffstat (limited to 'drivers/watchdog/watchdog_pretimeout.c')
| -rw-r--r-- | drivers/watchdog/watchdog_pretimeout.c | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/drivers/watchdog/watchdog_pretimeout.c b/drivers/watchdog/watchdog_pretimeout.c index 72612255fb55..098c965f6c78 100644 --- a/drivers/watchdog/watchdog_pretimeout.c +++ b/drivers/watchdog/watchdog_pretimeout.c @@ -60,7 +60,8 @@ int watchdog_register_governor(struct watchdog_governor *gov) { struct watchdog_pretimeout *p; - if (!default_gov) { + if (!strncmp(gov->name, WATCHDOG_PRETIMEOUT_DEFAULT_GOV, + WATCHDOG_GOV_NAME_MAXLEN)) { spin_lock_irq(&pretimeout_lock); default_gov = gov; @@ -79,9 +80,6 @@ void watchdog_unregister_governor(struct watchdog_governor *gov) struct watchdog_pretimeout *p; spin_lock_irq(&pretimeout_lock); - if (gov == default_gov) - default_gov = NULL; - list_for_each_entry(p, &pretimeout_list, entry) if (p->wdd->gov == gov) p->wdd->gov = default_gov; |