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Revert "watchdog: iTCO_wdt: Account for rebooting on second timeout"

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This reverts commit 39ed17de8c6ff54c7ed4605a4a8e04a2e2f0b82e which is
commit cb011044e34c293e139570ce5c01aed66a34345c upstream.

It is reported to cause problems with systems and probably should not
have been backported in the first place :(

Link: https://lore.kernel.org/r/20210803165108.4154cd52@endymion
Reported-by: Jean Delvare <jdelvare@suse.de>
Cc: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Wim Van Sebroeck <wim@linux-watchdog.org>
Cc: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Greg Kroah-Hartman 2021-08-06 08:28:48 +02:00
parent 1b1a00b13c
commit e2b7a4ccbf
1 changed files with 3 additions and 9 deletions
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12
drivers/watchdog/iTCO_wdt.c
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@ -73,8 +73,6 @@
#define TCOBASE(p) ((p)->tco_res->start)
/* SMI Control and Enable Register */
#define SMI_EN(p) ((p)->smi_res->start)
#define TCO_EN (1 << 13)
#define GBL_SMI_EN (1 << 0)
#define TCO_RLD(p) (TCOBASE(p) + 0x00) /* TCO Timer Reload/Curr. Value */
#define TCOv1_TMR(p) (TCOBASE(p) + 0x01) /* TCOv1 Timer Initial Value*/
@ -359,12 +357,8 @@ static int iTCO_wdt_set_timeout(struct watchdog_device *wd_dev, unsigned int t)
tmrval = seconds_to_ticks(p, t);
/*
* If TCO SMIs are off, the timer counts down twice before rebooting.
* 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))
/* For TCO v1 the timer counts down twice before rebooting */
if (p->iTCO_version == 1)
tmrval /= 2;
/* from the specs: */
@ -529,7 +523,7 @@ static int iTCO_wdt_probe(struct platform_device *pdev)
* Disables TCO logic generating an SMI#
*/
val32 = inl(SMI_EN(p));
val32 &= ~TCO_EN; /* Turn off SMI clearing watchdog */
val32 &= 0xffffdfff; /* Turn off SMI clearing watchdog */
outl(val32, SMI_EN(p));
}