linux-kernel - Re: [WATCHDOG] v2.5.25-rc patches

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Date:	Tue, 11 Mar 2008 14:21:16 +0100
From:	Oliver Schuster <olivers137@....com>
To:	linux-kernel@...r.kernel.org
CC:	win@...ana.be
Subject: Re: [WATCHDOG] v2.5.25-rc patches

Hi,

WARNING

this patch can cause serious problems in the case, that someone use it with an it8712 rev. 8 and above.

You patch it8712f_wdt.c in function it8712f_wdt_update_margin(void):
...
+	if (revision >= 0x08)
+		superio_outw(units, WDT_TIMEOUT);
+	else
+		superio_outb(units, WDT_TIMEOUT);

but here you can't use superio_outw, because the bytes are swaped -- historical reason.
I suggest to substitute 
	superio_outw(units, WDT_TIMEOUT);
with
	superio_outb(units >> 8, WDT_TIMEOUT + 1);
	superio_outb(units, WDT_TIMEOUT);

or to change the patch with (only the referenced position above)

+	if (revision >= 0x08)
+		superio_outb(units >> 8, WDT_TIMEOUT + 1);
+
+	superio_outb(units, WDT_TIMEOUT);

Regards,
Oliver

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