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@xxxxxxxxxxxxxxx>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From aec42642d91fc86ddc03e97f0139c6c34ee6b6b1 Mon Sep 17 00:00:00 2001
From: Jan Kiszka <jan.kiszka@xxxxxxxxxxx>
Date: Mon, 26 Jul 2021 13:46:13 +0200
Subject: [PATCH] watchdog: iTCO_wdt: Fix detection of SMI-off case
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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@xxxxxxxxxxxxxxx
Reported-by: Mantas Mikulėnas <grawity@xxxxxxxxx>
Signed-off-by: Jan Kiszka <jan.kiszka@xxxxxxxxxxx>
Reviewed-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Reviewed-by: Guenter Roeck <linux@xxxxxxxxxxxx>
Tested-by: Mantas Mikulėnas <grawity@xxxxxxxxx>
Link: https://lore.kernel.org/r/d84f8e06-f646-8b43-d063-fb11f4827044@xxxxxxxxxxx
Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx>
Signed-off-by: Wim Van Sebroeck <wim@xxxxxxxxxxxxxxxxxx>
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: */
