recent commit causes lock up

hi there,

running r224715 i'm having no problems what so ever. after upgrading my kernel
to r224784, i'm experiencing fatal lock ups, where only a hard reset will
resolve the problem.

the lock up happend two times while running chromium with only a decent number
of tabs (~ 5). also the lock up occured only after ~ 5 minutes uptime and an
uptime of chromium of only ~ 2 minutes.

i've now reverted my kernel back to r224715 and everything's working again.

cheers.
alex