Re: XT-PIC interrupts blocked by usbserial ? [Was Re: Intel ICH9M bug : sata unusable with usbserial]

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Hello.

Philippe De Muyter wrote:

Summary :

When I started to listen to a USB serial GPS receiver, the interrupts
of my sata disk were blocked until reboot :(

Switching in the BIOS from 'APIC disabled' to 'APIC enabled' made the problem
disappear.

previously we had all but one usb interrupts on the same line as ata_piix :
  5:      17183    XT-PIC-XT-PIC    ata_piix, ata_piix, ehci_hcd:usb1, ehci_hcd:usb2, uhci_hcd:usb3, uhci_hcd:usb5, uhci_hcd:usb6, uhci_hcd:usb7, uhci_hcd:usb8
while now they are spread on different lines : 16, 18, 19, 21 and 22

So I wonder if there is still a bug, but that it is not triggered anymore.

Is there a way to tell which interrupt line the USB GPS receiver is connected
to ?
See which USB bus the device is on, using lsusb.  It should match up
with the usbX number in the above list.

Given that I get :

  tmp199:~ # lsusb
  ...
  Bus 007 Device 002: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial Port
  tmp199:~ # cat /proc/interrupts
	     CPU0       CPU1
  ...
   19:     996143     995511   IO-APIC-fasteoi   ata_piix, ata_piix, uhci_hcd:usb5, uhci_hcd:usb7
  tmp199:~ #

my USB GPS receiver and my sata disk still share the same interrupt, I assume ?

What's changed now is that this interrupt line is now IO-APIC-fasteoi instead
of XT-PIC-XT-PIC.  Maybe there's something to look at there ?

Glad enabling APIC in your BIOS fixed this.

I am glad too :)

Nothing got "fixed" by doing that.
Swept under the rug, yes.

But the bug is still there.

If it is a bug (what I also believe) it is not a new one :

Before installing 2.6.37-20-desktop (opensuse 11.4) on this new hardware,
I had the same problem with 2.6.31.14-0.6-desktop (opensuse 11.2) and
with 2.6.22.18-0.2-default (opensuse 10.3)

The only interesting file where I find the word 'XT-PIC' is
	arch/alpha/kernel/irq_i8259.c

Why it's interesting if you're not really on Alpha? Because there is also arch/x86/kernel/i8259.c (and several others)...

Best regards

Philippe

WBR, Sergei
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