This is a note to let you know that I've just added the patch titled watchdog: Revert "iTCO_wdt: all versions count down twice" to the 4.13-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: watchdog-revert-itco_wdt-all-versions-count-down-twice.patch and it can be found in the queue-4.13 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From fc61e83a29308601e6e8a0759e24fc8fe2122692 Mon Sep 17 00:00:00 2001 From: Wim Van Sebroeck <wim@xxxxxxxxx> Date: Sat, 9 Sep 2017 17:41:24 +0200 Subject: watchdog: Revert "iTCO_wdt: all versions count down twice" From: Wim Van Sebroeck <wim@xxxxxxxxx> commit fc61e83a29308601e6e8a0759e24fc8fe2122692 upstream. This reverts commit 1fccb73011ea8a5fa0c6d357c33fa29c695139ea. Reported as Bug 196509 - iTCO_wdt regression reboot before timeout expire Signed-off-by: Wim Van Sebroeck <wim@xxxxxxxxx> Cc: Martin Wilck <mwilck@xxxxxxxx> Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- Documentation/watchdog/watchdog-parameters.txt | 2 +- drivers/watchdog/iTCO_wdt.c | 22 ++++++++++++---------- 2 files changed, 13 insertions(+), 11 deletions(-) --- a/Documentation/watchdog/watchdog-parameters.txt +++ b/Documentation/watchdog/watchdog-parameters.txt @@ -117,7 +117,7 @@ nowayout: Watchdog cannot be stopped onc ------------------------------------------------- iTCO_wdt: heartbeat: Watchdog heartbeat in seconds. - (5<=heartbeat<=74 (TCO v1) or 1226 (TCO v2), default=30) + (2<heartbeat<39 (TCO v1) or 613 (TCO v2), default=30) nowayout: Watchdog cannot be stopped once started (default=kernel config parameter) ------------------------------------------------- --- a/drivers/watchdog/iTCO_wdt.c +++ b/drivers/watchdog/iTCO_wdt.c @@ -306,15 +306,16 @@ static int iTCO_wdt_ping(struct watchdog iTCO_vendor_pre_keepalive(p->smi_res, wd_dev->timeout); - /* Reset the timeout status bit so that the timer - * needs to count down twice again before rebooting */ - outw(0x0008, TCO1_STS(p)); /* write 1 to clear bit */ - /* Reload the timer by writing to the TCO Timer Counter register */ - if (p->iTCO_version >= 2) + if (p->iTCO_version >= 2) { outw(0x01, TCO_RLD(p)); - else if (p->iTCO_version == 1) + } else if (p->iTCO_version == 1) { + /* Reset the timeout status bit so that the timer + * needs to count down twice again before rebooting */ + outw(0x0008, TCO1_STS(p)); /* write 1 to clear bit */ + outb(0x01, TCO_RLD(p)); + } spin_unlock(&p->io_lock); return 0; @@ -327,8 +328,11 @@ static int iTCO_wdt_set_timeout(struct w unsigned char val8; unsigned int tmrval; - /* The timer counts down twice before rebooting */ - tmrval = seconds_to_ticks(p, t) / 2; + tmrval = seconds_to_ticks(p, t); + + /* For TCO v1 the timer counts down twice before rebooting */ + if (p->iTCO_version == 1) + tmrval /= 2; /* from the specs: */ /* "Values of 0h-3h are ignored and should not be attempted" */ @@ -381,8 +385,6 @@ static unsigned int iTCO_wdt_get_timelef spin_lock(&p->io_lock); val16 = inw(TCO_RLD(p)); val16 &= 0x3ff; - if (!(inw(TCO1_STS(p)) & 0x0008)) - val16 += (inw(TCOv2_TMR(p)) & 0x3ff); spin_unlock(&p->io_lock); time_left = ticks_to_seconds(p, val16); Patches currently in stable-queue which might be from wim@xxxxxxxxx are queue-4.13/watchdog-revert-itco_wdt-all-versions-count-down-twice.patch