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SubjectRe: 2.6.12-rc1-mm3: box hangs solid on resume from disk while resuming device drivers
Date
Hi,

On Friday, 25 of March 2005 15:19, Rafael J. Wysocki wrote:
> On Friday, 25 of March 2005 13:54, you wrote:
> ]--snip--[
> > >My box is still hanged solid on resume (swsusp) by the drivers:
> > >
> > >ohci_hcd
> > >ehci_hcd
> > >yenta_socket
> > >
> > >possibly others, too. To avoid this, I had to revert the following
> > patch from the Len's tree:
> > >
> > >diff -Naru a/drivers/acpi/pci_link.c b/drivers/acpi/pci_link.c
> > >--- a/drivers/acpi/pci_link.c 2005-03-24 04:57:27 -08:00
> > >+++ b/drivers/acpi/pci_link.c 2005-03-24 04:57:27 -08:00
> > >@@ -72,10 +72,12 @@
> > > u8 active; /* Current IRQ
> > */
> > > u8 edge_level; /* All IRQs */
> > > u8 active_high_low; /* All IRQs */
> > >- u8 initialized;
> > > u8 resource_type;
> > > u8 possible_count;
> > > u8 possible[ACPI_PCI_LINK_MAX_POSSIBLE];
> > >+ u8 initialized:1;
> > >+ u8 suspend_resume:1;
> > >+ u8 reserved:6;
> > > };
> > >
> > > struct acpi_pci_link {
> > >@@ -530,6 +532,10 @@
> > >
> > > ACPI_FUNCTION_TRACE("acpi_pci_link_allocate");
> > >
> > >+ if (link->irq.suspend_resume) {
> > >+ acpi_pci_link_set(link, link->irq.active);
> > >+ link->irq.suspend_resume = 0;
> > >+ }
> > > if (link->irq.initialized)
> > > return_VALUE(0);
> >
> > How about just remove below line:
> > >+ acpi_pci_link_set(link, link->irq.active);
>
> You mean apply the patch again and remove just the single
> line? No effect (ie hangs).

It looks like removing this line couldn't help.

Apparently, acpi_pci_link_set(link, link->irq.active) must be called
_before_ the call to pci_write_config_word() in
drivers/pci/pci.c:pci_set_power_state(), because the box hangs
otherwise. However, with the patch applied,
acpi_pci_link_set(link, link->irq.active) is only called through
pcibios_enable_irq() in pcibios_enable_device(), which is _after_
the call to pci_set_power_state() in pci_enable_device_bars(),
so it's too late.

Hence, it seems, if you really want to get rid of the
irqrouter_resume(), whatever the reason, the simplest fix
seems to be to change the order of calls to pci_set_power_state()
and pcibios_enable_device() in pci_enable_device_bars():

--- old/drivers/pci/pci.c 2005-03-26 19:10:09.000000000 +0100
+++ linux-2.6.12-rc1-mm2/drivers/pci/pci.c 2005-03-26 19:10:54.000000000 +0100
@@ -442,9 +442,9 @@ pci_enable_device_bars(struct pci_dev *d
{
int err;

- pci_set_power_state(dev, PCI_D0);
if ((err = pcibios_enable_device(dev, bars)) < 0)
return err;
+ pci_set_power_state(dev, PCI_D0);
return 0;
}

though I'm not sure if that's legal.
Greets,
Rafael


--
- Would you tell me, please, which way I ought to go from here?
- That depends a good deal on where you want to get to.
-- Lewis Carroll "Alice's Adventures in Wonderland"
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