The kernel wdt counting down even when not pinged. Shutdown the filehandler to /dev/watchdog with magic cookie to prevent this.
Signed-off-by: Alexander Couzens <[email protected]> --- watchdog.c | 17 ++++++++++++++--- 1 file changed, 14 insertions(+), 3 deletions(-) I'm not certainly clear, the previous behaviour was a bug or feature. If stop=True should really only stop the pinging thread, I really would like to shutdown the watchdog gracefully on another way. E.g. with another argument shutdown. Best lynxis diff --git a/watchdog.c b/watchdog.c index 592ae7e..025942b 100644 --- a/watchdog.c +++ b/watchdog.c @@ -45,11 +45,23 @@ static void watchdog_timeout_cb(struct uloop_timeout *t) uloop_timeout_set(t, wdt_frequency * 1000); } +static void watchdog_stop() +{ + if (wdt_fd >= 0 && write(wdt_fd, "V", 1) < 0) + ERROR("WDT failed to write magic close sequence: %s\n" + "WDT may not stopped properly.\n", strerror(errno)); + if (close(wdt_fd) < 0) + ERROR("WDT failed to close watchdog fd: %s\n" + "WDT may not stopped properly.\n", strerror(errno)); + wdt_fd = -1; +} + void watchdog_set_stopped(bool val) { - if (val) + if (val) { uloop_timeout_cancel(&wdt_timeout); - else + watchdog_stop(); + } else watchdog_timeout_cb(&wdt_timeout); } @@ -125,7 +137,6 @@ void watchdog_init(int preinit) DEBUG(4, "Opened watchdog with timeout %ds\n", watchdog_timeout(0)); } - void watchdog_no_cloexec(void) { if (wdt_fd < 0) -- 2.5.3 _______________________________________________ openwrt-devel mailing list [email protected] https://lists.openwrt.org/cgi-bin/mailman/listinfo/openwrt-devel
