After upgrading from 2.6.13 (with devfs enabled) to 2.6.17.5, the network
stopped working after a suspend. The problem is caused by the fact, that IRQ 5
is disabled during the supend. According to the dmesg output, it happens, while
all tasks are stopped. 

IRQ is used by 3 drivers:
* 8139too (eth0)
* sis9000 (eth1)
* ohci_hcd

To suspend, I do the following:
* shut down eth1
* rmmod ohci-hcd
* rmmod sis9000
(I'm unloading some other drivers too, but they do not affect IRQ 5)
* echo disk >/sys/power/state

At resume time, I reload the modules again and configure eth1 again. eth0 is
left configured all the time.

As the IRQ 5 is disabled, eth0 and eth1 emit messages about transmit timed out. 
All USB ports were not used during the tests.

To resolve the issue, I must remove the 3 drivers, which use IRQ 5. After
reloading them, the network is working.

This is a regression, as it is triggerd by booting the same system with 2.6.17.5
instead of 2.6.13.

With 2.6.13, the system handled lots of suspends without any problems.
With 2.6.17.5, the IRQ gets disabled during the first suspend.

lspci:
0000:00:00.0 Host bridge: Silicon Integrated Systems [SiS] 735 Host (rev 01)
0000:00:01.0 PCI bridge: Silicon Integrated Systems [SiS] Virtual PCI-to-PCI
bridge (AGP)
0000:00:02.0 ISA bridge: Silicon Integrated Systems [SiS] SiS85C503/5513 (LPC
Bridge)
0000:00:02.1 SMBus: Silicon Integrated Systems [SiS]: Unknown device 0016
0000:00:02.2 USB Controller: Silicon Integrated Systems [SiS] USB 1.0 Controller
(rev 07)
0000:00:02.3 USB Controller: Silicon Integrated Systems [SiS] USB 1.0 Controller
(rev 07)
0000:00:02.5 IDE interface: Silicon Integrated Systems [SiS] 5513 [IDE] (rev d0)
0000:00:02.7 Multimedia audio controller: Silicon Integrated Systems [SiS] Sound
Controller (rev a0)
0000:00:03.0 Ethernet controller: Silicon Integrated Systems [SiS] SiS900 PCI
Fast Ethernet (rev 90)
0000:00:0b.0 Ethernet controller: Realtek Semiconductor Co., Ltd.
RTL-8139/8139C/8139C+ (rev 10)
0000:00:0d.0 SCSI storage controller: LSI Logic / Symbios Logic 53c810 (rev 23)
0000:00:0f.0 Multimedia audio controller: C-Media Electronics Inc CM8738 (rev 10)
0000:01:00.0 VGA compatible controller: nVidia Corporation NV5M64 [RIVA TNT2
Model 64/Model 64 Pro] (rev 15)

cat /proc/interrupts:          CPU0
  0:     665475          XT-PIC  timer
  1:      10693          XT-PIC  i8042
  2:          0          XT-PIC  cascade
  4:          5          XT-PIC  serial
  5:     312032          XT-PIC  eth0, eth1, ohci_hcd:usb2
  8:          6          XT-PIC  rtc
  9:          1          XT-PIC  acpi
 11:          1          XT-PIC  ohci_hcd:usb1
 12:      60695          XT-PIC  i8042
 14:      27473          XT-PIC  ide0
 15:         23          XT-PIC  ide1
NMI:          0
LOC:          0
ERR:          0
MIS:          0

dmesg:
ohci_hcd 0000:00:02.3: remove, state 4
usb usb2: USB disconnect, address 1
ohci_hcd 0000:00:02.3: USB bus 2 deregistered
ACPI: PCI interrupt for device 0000:00:02.3 disabled
ohci_hcd 0000:00:02.2: remove, state 4
usb usb1: USB disconnect, address 1
ohci_hcd 0000:00:02.2: USB bus 1 deregistered
ACPI: PCI interrupt for device 0000:00:02.2 disabled
Stopping tasks: =================================================================|
Shrinking memory... done (29995 pages freed)
swsusp: Need to copy 24989 pages
Intel machine check architecture supported.
Intel machine check reporting enabled on CPU#0.
irq 5: nobody cared (try booting with the "irqpoll" option)
 <c013f8c4> __report_bad_irq+0x24/0x80  <c013f9be> note_interrupt+0x6e/0xf0
 <c013f3a3> __do_IRQ+0x93/0xb0  <c01052d9> do_IRQ+0x19/0x30
 <c0103822> common_interrupt+0x1a/0x20  <c01219f0> __do_softirq+0x30/0x90
 <c0121a76> do_softirq+0x26/0x30  <c01052de> do_IRQ+0x1e/0x30
 <c0103822> common_interrupt+0x1a/0x20  <c015a4f4> cache_grow+0x84/0x140
 <c035d85d> set_cursor+0x4d/0x60  <c015a6ce> cache_alloc_refill+0x11e/0x1a0
 <c015a91d> kmem_cache_alloc+0x3d/0x40  <c0333105> acpi_os_acquire_object+0xb/0x36
 <c03485fa> acpi_ut_create_generic_state+0xb/0x23  <c0340925>
acpi_ns_evaluate_relative+0x41/0xc7
 <c034485b> acpi_rs_set_srs_method_data+0x8f/0xb4  <c034b98d>
acpi_pci_link_set+0x10b/0x18a
 <c034be19> irqrouter_resume+0x26/0x44  <c0371714> __sysdev_resume+0x74/0x80
 <c03719cb> sysdev_resume+0x3b/0x6b  <c0376325> device_power_up+0x5/0xa
 <c0136a36> swsusp_suspend+0x56/0xa0  <c0136c0f> pm_suspend_disk+0x4f/0x90
 <c0135e4a> enter_state+0x7a/0x90  <c0135fa1> state_store+0x91/0x99
 <c0135f10> state_store+0x0/0x99  <c0198428> subsys_attr_store+0x38/0x40
 <c019869e> flush_write_buffer+0x2e/0x40  <c01986e7> sysfs_write_file+0x37/0x60
 <c015d7c1> vfs_write+0xb1/0x160  <c015d937> sys_write+0x47/0x80
 <c0102e57> syscall_call+0x7/0xb
handlers:
[<d0aeff50>] (rtl8139_interrupt+0x0/0x150 [8139too])
Disabling IRQ #5
PM: Writing back config space on device 0000:00:02.2 at offset 1 (was 2800117,
writing 2800113)
PM: Writing back config space on device 0000:00:02.3 at offset 1 (was 2800117,
writing 2800113)
ACPI: PCI Interrupt 0000:00:03.0[A] -> Link [LNKG] -> GSI 5 (level, low) -> IRQ 5
eth0: link up, 100Mbps, full-duplex, lpa 0x41E1
Restarting tasks... done
ACPI: Power Button (FF) [PWRF]
ACPI: Sleep Button (CM) [SLPB]
parport0: PC-style at 0x378 (0x778) [PCSPP,TRISTATE]
parport0: irq 7 detected
ohci_hcd: 2005 April 22 USB 1.1 'Open' Host Controller (OHCI) Driver (PCI)
ACPI: PCI Interrupt 0000:00:02.2[D] -> Link [LNKD] -> GSI 11 (level, low) -> IRQ 11
ohci_hcd 0000:00:02.2: OHCI Host Controller
ohci_hcd 0000:00:02.2: new USB bus registered, assigned bus number 1
ohci_hcd 0000:00:02.2: irq 11, io mem 0xcfffd000
usb usb1: configuration #1 chosen from 1 choice
hub 1-0:1.0: USB hub found
hub 1-0:1.0: 3 ports detected
ACPI: PCI Interrupt 0000:00:02.3[A] -> Link [LNKH] -> GSI 5 (level, low) -> IRQ 5
ohci_hcd 0000:00:02.3: OHCI Host Controller
ohci_hcd 0000:00:02.3: new USB bus registered, assigned bus number 2
ohci_hcd 0000:00:02.3: irq 5, io mem 0xcfffe000
usb usb2: configuration #1 chosen from 1 choice
hub 2-0:1.0: USB hub found
hub 2-0:1.0: 3 ports detected

mfg Martin K