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    SubjectRe: [Bug #12162] Commit 7cd5b08be3 breaks startup on Toshiba Portege R500

    Rafael, I'm assuming my one-liner patch fixes your problem too, since you
    attached the patch to the bugzilla entry. So I committed it as such. But
    if it doesn't, we'll need to do something else.

    The commit ended up being as appended..

    From: Linus Torvalds <>
    Date: Wed, 3 Dec 2008 16:20:19 -0800
    Subject: [PATCH] iTCO_wdt: fix typo when setting TCO_EN bit

    The code used '&= 0x00002000' when it tried to set the TCO_EN bit, which
    obviously didn't set that bit at all, but instead just reset all the
    other bits in the SMI_EN register.

    This bug seemingly caused various random behavior, with Frans Pop
    reporting that just silently hung at startup and Rafael Wysocki
    reports the fan spinning with full speed.


    The problem seems to have been triggered by "[WATCHDOG] iTCO_wdt :
    problem with rebooting on new ICH9 based motherboards" (commit
    7cd5b08be3c489df11b559fef210b81133764ad4), but the bogus code existed
    before that too (in the "supermicro_old_pre_stop()" function), it just
    apparently never showed up due to different logic.

    In that commit the broken code got moved around and now gets executed
    much more.

    Reported-by: Rafael J. Wysocki <>
    Tested-by: Frans Pop <>
    Cc: Wim Van Sebroeck <>
    Signed-off-by: Linus Torvalds <>
    drivers/watchdog/iTCO_wdt.c | 2 +-
    1 files changed, 1 insertions(+), 1 deletions(-)

    diff --git a/drivers/watchdog/iTCO_wdt.c b/drivers/watchdog/iTCO_wdt.c
    index 26173a2..5b395a4 100644
    --- a/drivers/watchdog/iTCO_wdt.c
    +++ b/drivers/watchdog/iTCO_wdt.c
    @@ -392,7 +392,7 @@ static int iTCO_wdt_stop(void)

    /* Bit 13: TCO_EN -> 1 = Enables the TCO logic to generate SMI# */
    val32 = inl(SMI_EN);
    - val32 &= 0x00002000;
    + val32 |= 0x00002000;
    outl(val32, SMI_EN);

    /* Set the NO_REBOOT bit to prevent later reboots, just for sure */

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      Last update: 2008-12-04 01:37    [W:0.024 / U:15.440 seconds]
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