Comment # 24 on bug 1051059 from Takashi Iwai

(In reply to Joey Lee from comment #22)
> > I'm not sure whether it's safe to assume that.  Basically you're calling
> > some sleepable functions like mutex or kmalloc with GFP_KERNEL inside the
> > local irq-disabled context.  This may not work.
> 
> Is that because using sleepable functions in irq-disabled context that it
> may causes the irq disable too long then causes hard lock?

Not only too long.  Since the code path already disabled non-boot CPUs, it
means the system may get stuck completely.

In anyway, I merged the patch to SLE and openSUSE branches.  Let's close this
bug for now.
Feel free to reopen if you still see the problem.  Thanks.