The patch below does not apply to the 4.19-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From aec42642d91fc86ddc03e97f0139c6c34ee6b6b1 Mon Sep 17 00:00:00 2001
From: Jan Kiszka jan.kiszka@siemens.com Date: Mon, 26 Jul 2021 13:46:13 +0200 Subject: [PATCH] watchdog: iTCO_wdt: Fix detection of SMI-off case MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit
Obviously, the test needs to run against the register content, not its address.
Fixes: cb011044e34c ("watchdog: iTCO_wdt: Account for rebooting on second timeout") Cc: stable@vger.kernel.org Reported-by: Mantas Mikulėnas grawity@gmail.com Signed-off-by: Jan Kiszka jan.kiszka@siemens.com Reviewed-by: Paolo Bonzini pbonzini@redhat.com Reviewed-by: Guenter Roeck linux@roeck-us.net Tested-by: Mantas Mikulėnas grawity@gmail.com Link: https://lore.kernel.org/r/d84f8e06-f646-8b43-d063-fb11f4827044@siemens.com Signed-off-by: Guenter Roeck linux@roeck-us.net Signed-off-by: Wim Van Sebroeck wim@linux-watchdog.org
diff --git a/drivers/watchdog/iTCO_wdt.c b/drivers/watchdog/iTCO_wdt.c index b3f604669e2c..643c6c2d0b72 100644 --- a/drivers/watchdog/iTCO_wdt.c +++ b/drivers/watchdog/iTCO_wdt.c @@ -362,7 +362,7 @@ static int iTCO_wdt_set_timeout(struct watchdog_device *wd_dev, unsigned int t) * Otherwise, the BIOS generally reboots when the SMI triggers. */ if (p->smi_res && - (SMI_EN(p) & (TCO_EN | GBL_SMI_EN)) != (TCO_EN | GBL_SMI_EN)) + (inl(SMI_EN(p)) & (TCO_EN | GBL_SMI_EN)) != (TCO_EN | GBL_SMI_EN)) tmrval /= 2;
/* from the specs: */