hibernate causes nobody cared on acpi irq

[Jiri Slaby <jirislaby@gmail.com>]

Hi,

with current mmotm I get this while trying to hibernate from a system in
qemu:

PM: Syncing filesystems ... done.
Freezing user space processes ... (elapsed 0.00 seconds) done.
Freezing remaining freezable tasks ... (elapsed 0.03 seconds) done.
PM: Preallocating image memory... done (allocated 7986 pages)
PM: Allocated 31944 kbytes in 0.01 seconds (3194.40 MB/s)
ACPI: Preparing to enter system sleep state S4
PM: Saving platform NVS memory
Disabling non-boot CPUs ...
Cannot set affinity for irq 0
CPU 1 is now offline
SMP alternatives: switching to UP code
CPU1 is down
PM: Creating hibernation image:
PM: Need to copy 7687 pages
PM: Hibernation image created (7687 pages copied)
Enabling non-boot CPUs ...
SMP alternatives: switching to SMP code
Booting processor 1 APIC 0x1 ip 0x6000
Initializing CPU#1
Calibrating delay using timer specific routine.. 5985.37 BogoMIPS
(lpj=11970749)
CPU: L1 I cache: 32K, L1 D cache: 32K
CPU: L2 cache: 2048K
mce: CPU supports 32 MCE banks
CPU1: Intel QEMU Virtual CPU version 0.10.50 stepping 03
checking TSC synchronization [CPU#0 -> CPU#1]: passed.
Switched to high resolution mode on CPU 1
CPU1 is up
ACPI: Waking up from system sleep state S4
irq 9: nobody cared (try booting with the "irqpoll" option)
Pid: 497, comm: sh Tainted: G        W  2.6.31-rc5-mm1_64 #668
Call Trace:
 <IRQ>  [<ffffffff810815c6>] __report_bad_irq+0x26/0xa0
 [<ffffffff810817d0>] note_interrupt+0x190/0x1d0
 [<ffffffff81197e49>] ? acpi_irq+0x11/0x2c
 [<ffffffff81081e17>] handle_fasteoi_irq+0xb7/0xe0
 [<ffffffff8100e80d>] handle_irq+0x1d/0x30
 [<ffffffff8100dd37>] do_IRQ+0x67/0xe0
 [<ffffffff8100c813>] ret_from_intr+0x0/0xa
 [<ffffffff8104543f>] ? __do_softirq+0x5f/0x130
 [<ffffffff8102449d>] ? ack_apic_level+0x7d/0x1e0
 [<ffffffff8100cf9c>] ? call_softirq+0x1c/0x30
 [<ffffffff8100e7bd>] ? do_softirq+0x4d/0x80
 [<ffffffff8104520d>] ? irq_exit+0x7d/0x90
 [<ffffffff8100dd40>] ? do_IRQ+0x70/0xe0
 [<ffffffff8100c813>] ? ret_from_intr+0x0/0xa
 <EOI>  [<ffffffff81429c08>] ? _spin_unlock_irqrestore+0x8/0x10
 [<ffffffff810830a3>] ? resume_device_irqs+0x73/0x90
 [<ffffffff8123fb31>] ? dpm_resume_noirq+0xb1/0xc0
 [<ffffffff8106edaa>] ? hibernation_snapshot+0x12a/0x230
 [<ffffffff8106ef84>] ? hibernate+0xd4/0x1a0
 [<ffffffff8106d88c>] ? state_store+0xec/0x100
 [<ffffffff81168987>] ? kobj_attr_store+0x17/0x20
 [<ffffffff81119190>] ? sysfs_write_file+0xe0/0x160
 [<ffffffff810c1648>] ? vfs_write+0xb8/0x1a0
 [<ffffffff8142c5a5>] ? do_page_fault+0x185/0x350
 [<ffffffff810c1f4c>] ? sys_write+0x4c/0x80
 [<ffffffff810cf1c0>] ? sys_fcntl+0x150/0x410
 [<ffffffff8100beeb>] ? system_call_fastpath+0x16/0x1b
handlers:
[<ffffffff81197e38>] (acpi_irq+0x0/0x2c)
Disabling IRQ #9

I use this hunk to prevent bh enablement btw.:
diff --git a/kernel/hw_breakpoint.c b/kernel/hw_breakpoint.c
index c1f64e6..bc5368d 100644
--- a/kernel/hw_breakpoint.c
+++ b/kernel/hw_breakpoint.c
@@ -80,17 +80,15 @@ void load_debug_registers(void)
        unsigned long flags;
        struct task_struct *tsk = current;

-       spin_lock_bh(&hw_breakpoint_lock);
+       spin_lock_irqsave(&hw_breakpoint_lock, flags);

        /* Prevent IPIs for new kernel breakpoint updates */
-       local_irq_save(flags);
        arch_update_kernel_hw_breakpoint(NULL);
-       local_irq_restore(flags);

        if (test_tsk_thread_flag(tsk, TIF_DEBUG))
                arch_install_thread_hw_breakpoint(tsk);

-       spin_unlock_bh(&hw_breakpoint_lock);
+       spin_unlock_irqrestore(&hw_breakpoint_lock, flags);
 }

 /*