Reboot problem with nouveau - bisected

[Marc Dionne]

My machine has been getting stuck when rebooting during the current
3.9 cycle, and yesterday I took the time to bisect the problem to this
commit:

32256c87ead3edec86bed5023a0ff96a6d907931:  drm/nouveau/fifo/nvc0:
improve interrupt handler somewhat

    Logs extra info for interrupts that have a sub-status register, and
    handles the "special" ack from INTR bit 31.

    Signed-off-by: Ben Skeggs <bskeggs@xxxxxxxxxx>

The symptom when rebooting is that the console starts spitting out a
continuous stream of identical messages like this (transcribed by
hand):

    nouveau W[   PFIFO][0000:03:00.0] INTR 0x01000000: 0x00000005

The system is then unresponsive until it is reset.  Just commenting
out the corresponding nv_warn() in
drivers/gpu/drm/nouveau/core/engine/fifo/nvc0.c is enough to allow the
system to reboot normally.

Video card in this system is (from lspci -v):

03:00.0 VGA compatible controller: NVIDIA Corporation GF119 [GeForce
GT 520] (rev a1) (prog-if 00 [VGA controller])
    Subsystem: Micro-Star International Co., Ltd. Device 2630
    Flags: bus master, fast devsel, latency 0, IRQ 16
    Memory at fa000000 (32-bit, non-prefetchable) [size=16M]
    Memory at d8000000 (64-bit, prefetchable) [size=128M]
    Memory at d6000000 (64-bit, prefetchable) [size=32M]
    I/O ports at bc00 [size=128]
    Expansion ROM at fbb80000 [disabled] [size=512K]
    Capabilities: <access denied>
    Kernel driver in use: nouveau

Marc
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