Messages in this thread | | | Date | Wed, 23 Jul 2008 21:50:24 +0200 | From | "Fabio Comolli" <> | Subject | Re: New conflict message in latest GIT |
| |
Hi.
On Wed, Jul 23, 2008 at 8:56 PM, Bjorn Helgaas <bjorn.helgaas@hp.com> wrote: > On Tuesday 22 July 2008 12:56:36 pm Fabio Comolli wrote: >> Linus' GIT tree 2.6.26-05752-g93ded9b shows this message: >> >> i801_smbus 0000:00:1f.3: PCI INT B -> GSI 19 (level, low) -> IRQ 19 >> ACPI: I/O resource 0000:00:1f.3 [0x18e0-0x18ff] conflicts with ACPI >> region SMBI [0x18e0-0x18ef] >> ACPI: Device needs an ACPI driver >> >> There is no equivalent in 2.6.26 or previous kernels. > > The "ACPI: I/O resource ... conflicts with ..." message was added by > Thomas: > http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=df92e695998e1bc6e426a840eb86d6d1ee87e2a5 > > That conflict checking infrastructure was in 2.6.26, but Jean's > change to make the i801_smbus driver use it didn't happen until > about a week ago: > http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=54fb4a05af0a4b814e6716cfdf3fa97fc6be7a32 > > The message is telling us that the i801_smbus driver thinks it owns > the 0x18e0-0x18ff region, but there's also an ACPI opregion that > references that region. There's no coordination between ACPI and > the i801_smbus driver, so there may be issues where nearly > simultaneous accesses cause incorrect behavior, e.g,. one may > read the wrong value from a temperature sensor. That, of course, > can lead to more serious things like unintended machine shutdowns. > > I don't have any ideas about how to address this. I think Thomas's > intent was to collect better information for unreproducible bugs. > (Maybe this sort of conflict should even set a taint flag?) >
OK, I actually didn't even know what i801_smbus (i2c_801 I suppose) was. It seems that my laptop has a super-IO chip which is detected by lm-sensors as `Nat. Semi. PC87591 Super IO' which doesn't have a driver and never will.
So, if I'm correct, this modules is totally useless for me and I better compile it out. Am I correct?
> Bjorn > >
Regards, Fabio
| |