[lm-sensors] Kernel hangs with i2c-i801 driver?

Ymu at Winbond.com.tw Ymu at Winbond.com.tw
Thu Dec 8 08:46:23 CET 2005


> -----Original Message-----
> From: lm-sensors-bounces at lm-sensors.org
[mailto:lm-sensors-bounces at lm-sensors.org] On Behalf Of Henrique de
Moraes Holschuh
> Sent: Wednesday, December 07, 2005 7:08 PM
> To: lm-sensors at lm-sensors.org
> Subject: Re: [lm-sensors] Kernel hangs with i2c-i801 driver?
> 
> On Wed, 07 Dec 2005, Daniel Nilsson wrote:
> > The BIOS logs the events and does fan controls based on the
interrupts of
> > w83792. But BIOS always enables interrupt of W83792 even when
miniBMC is
> > disabled because BIOS needs it for fan controls.
> 
> Maybe I am asking something too stupid, but what would happen if there
is a
> race condition between the linux kernel and the BIOS APM code and both
try
> to access the chip at the same time?  A Linux kernel spinlock won't
protect
> the chip against rogue hardware access by the BIOS, unless that GPIO
> interrupt is disabled in the South Bridge.
> 
> --
>   "One disk to rule them all, One disk to find them. One disk to bring
>   them all and in the darkness grind them. In the Land of Redmond
>   where the shadows lie." -- The Silicon Valley Tarot
>   Henrique Holschuh
> 
Hello Henrique,

Thanks for your comments.
Just as what you described,
It seems that all hang happened when we access the chip (sensors -s
command or i2cset command).
Do you think it's should be the faulty of the man made BIOS?
If so, I'm quiet agree with you ;)

Best Regards
Yuan Mu



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