Re: [PATCH] IDE: Fix Power Management request race on resume

[Benjamin Herrenschmidt]

On Wed, 2003-09-10 at 11:25, cb-lkml@xxxxxxxxxxxxxxxxx wrote:
> On Wed, Sep 10, 2003 at 11:16:15AM +0200, Benjamin Herrenschmidt wrote:
> > On Wed, 2003-09-10 at 11:04, cb-lkml@xxxxxxxxxxxxxxxxx wrote:
> > > I applied this patch to 2.6.0-test5 and still have this problem:
> > > 
> > > http://marc.theaimsgroup.com/?l=linux-kernel&m=106218353005043&w=2
> > 
> > There are a couple of other fixes pending though I don't thing
> > they are related to your problem. Do you have a slave drive on
> > this channel ? What driver are you using for the host controller ?
> > Does it have a dma_check() function ?
> 
> It's a laptop, so there's no slave drive.

Some laptops have the CD/DVD as a slave
> 
> The host controller is a PIIX4, using CONFIG_BLK_DEV_PIIX. (Presumably
> drivers/ide/pci/piix.c)
> 
> $ grep dma_check piix.c 
>         hwif->ide_dma_check = &piix_config_drive_xfer_rate;

Can you put some printk in there to verify it's properly called on
wakeup and that it actually does something ?

Note that problem may be unrelated to the IDE driver, it could also
be some APIC problem messing with interrupts...

Ben.


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