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unexpected irq 71 on ip32

DISCUSSION Giuseppe Sacco 2 participants 4 messages Mar 17, 2008 MIPS

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Giuseppe Sacco

author
#0 lore raw

Hi all,
since 2.6.24 I find this message on the console. The message is displayed very randomly (or, I cannot find any related event), once or twice a week.

irq 71, desc: ffffffff803fccf0, depth: 1, count: 0, unhandled: 0 ->handle_irq(): ffffffff80069510, handle_bad_irq+0x0/0x2c0 ->chip(): ffffffff803f6610, 0xffffffff803f6610 ->action(): 0000000000000000
IRQ_DISABLED set
IRQ_NOPROBE set

from what I understand, this is an irq related to serial line ttyS1. On this line I have a modem managed by hylafax, but those messages are displayed even when there is no activity on the modem line.

Bye,
Giuseppe

maintainer
#1 lore raw
Quoted 1 line · Giuseppe Sacco

from what I understand, this is an irq related to serial line ttyS1. On

not on my O2:

serial8250.0: ttyS0 at MMIO 0x1f390000 (irq = 60) is a 16550A console [ttyS0] enabled
serial8250.0: ttyS1 at MMIO 0x1f398000 (irq = 66) is a 16550A

Is there something listed for irq 71 in /proc/interrupts ?

Thomas.

Signature · 2 lines
Crap can work. Given enough thrust pigs will fly, but it's not necessary a
good idea.                                                [ RFC1925, 2.3 ]
author
#2 lore raw

Hi Thomas,

Il giorno lun, 17/03/2008 alle 11.01 +0100, Thomas Bogendoerfer ha scritto:

Quoted 2 lines · Giuseppe Sacco
Quoted 1 line

from what I understand, this is an irq related to serial line ttyS1. On

my understanding is due to:

$ grep 71 arch/mips/sgi-ip32/*irq*
arch/mips/sgi-ip32/ip32-irq.c: * 26-31 -> 66-71 Serial 2 (28 E)
Quoted 7 lines

not on my O2:

serial8250.0: ttyS0 at MMIO 0x1f390000 (irq = 60) is a 16550A console [ttyS0] enabled
serial8250.0: ttyS1 at MMIO 0x1f398000 (irq = 66) is a 16550A

Is there something listed for irq 71 in /proc/interrupts ?

nope:

giuseppe@sgi:~$ cat /proc/interrupts 
           CPU0       
  7:    1949649            MIPS  timer
 11:     106073       IP32 MACE  SGI O2 Fast Ethernet
 15:          0       IP32 MACE  MACE PCI error
 16:     487646   IP32 MACE PCI  aic7xxx
 17:         15   IP32 MACE PCI  aic7xxx
 18:          0   IP32 MACE PCI  ohci_hcd:usb1
 21:          0   IP32 MACE PCI  ohci_hcd:usb2
 22:      62066   IP32 MACE PCI  ehci_hcd:usb3, eth100
 28:          0      IP32 CRIME  CRIME CPU error
 29:          1      IP32 CRIME  CRIME memory error
 48:          0   IP32 MACE ISA  rtc
 49:         10   IP32 MACE ISA  PS2 port
 51:        133   IP32 MACE ISA  PS2 port
 60:        133   IP32 MACE ISA  serial

ERR: 0

Bye,
Giuseppe

maintainer
#3 lore raw
In reply to Giuseppe Sacco
Quoted 1 line · Giuseppe Sacco

from what I understand, this is an irq related to serial line ttyS1. On

I had a closer look, and it's related to ttyS1. Looks like the DMA interface for serial (probably RX DMA overrun). I'll have a look later, why we don't ignore this interrupt.

Thomas.

Signature · 2 lines
Crap can work. Given enough thrust pigs will fly, but it's not necessary a
good idea.                                                [ RFC1925, 2.3 ]