I've further debugged inside the merged branch, and got:

corsac@scapa: git bisect log
# bad: [a2c76b83fdd763c826f38a55127ccf25708099ce] usb: renesas_usbhs: fixup 
inconsistent return from usbhs_pkt_push()
# good: [2d03423b2319cc854adeb28a03f65de5b5e0ab63] Merge branch 
'driver-core-next' of 
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core
git bisect start 'a2c76b8' '2d03423'
# good: [c6a389f123b9f68d605bb7e0f9b32ec1e3e14132] Linux 3.1-rc4
git bisect good c6a389f123b9f68d605bb7e0f9b32ec1e3e14132
# good: [a8b43c00ef06aec49b9fe0a5bad8a6a320e4d27b] USB: Fix runtime wakeup on 
OHCI
git bisect good a8b43c00ef06aec49b9fe0a5bad8a6a320e4d27b
# good: [1d749f9afa657f6ee9336b2bc1fcd750a647d157] USB: ftdi_sio.c: Use ftdi 
async_icount structure for TIOCMIWAIT, as in other drivers
git bisect good 1d749f9afa657f6ee9336b2bc1fcd750a647d157
# good: [55b5a624a0cc5aa4b350fd50d78cf3415f795bfe] usb: renesas_usbhs: tidyup 
for smatch warnings
git bisect good 55b5a624a0cc5aa4b350fd50d78cf3415f795bfe
# good: [0889551267e7b6b4d27dc9f726f3d0cb0d976105] USB: gadget: midi: fix range 
check in f_midi_out_open()
git bisect good 0889551267e7b6b4d27dc9f726f3d0cb0d976105
# good: [3a7655fcb210b349111251689d0a56b7250885ea] usb/isp1760: Allow to 
optionally trigger low-level chip reset via GPIOLIB.
git bisect good 3a7655fcb210b349111251689d0a56b7250885ea

with:


a2c76b83fdd763c826f38a55127ccf25708099ce is the first bad commit
commit a2c76b83fdd763c826f38a55127ccf25708099ce
Author: Kuninori Morimoto <kuninori.morimoto...@renesas.com>
Date:   Tue Oct 18 20:05:50 2011 -0700

    usb: renesas_usbhs: fixup inconsistent return from usbhs_pkt_push()
    
    usbhs_pkt_push() had inconsistent return under spin lock.
    This patch fix it up.
    Special thanks to Dan
    
    Cc: Dan Carpenter <dan.carpen...@oracle.com>
    Signed-off-by: Kuninori Morimoto <kuninori.morimoto...@renesas.com>
    Signed-off-by: Greg Kroah-Hartman <gre...@suse.de>

:040000 040000 08d80fa06121151b36ae17dc693c14d58c0d5db3
86b920618ceb575cebf610798c24a104dea36a2c M      drivers

So I'll try to rebuild a 3.2.1 with this commit reverted and report
back.

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https://bugs.launchpad.net/bugs/917962

Title:
  BUG: scheduling while atomic: swapper

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