Comment # 4 on bug 1213578 from Takashi Iwai

And, I'm building yet two more test kernels in OBS home:tiwai:bsc1213578-2 and
home:tiwai:bsc1213578-3 repos.

The first one is another upstream fix, and please test it in anyway to check
whether it gives more regression or not.

The latter one is a downstream fix for NULL dereferences, and this should work
around the Oops, at least.  If the previous two kernels don't work, please
check this one.  If this is the only one that works, I'll add this workaround
for the next update.