hvc console sleep under spinlock

[Nathan Lynch]

Anton Blanchard wrote:
> HVC console is calling copy_from_user inside a spinlock. Anyone want to
> have a stab at fixing it?

Would something like this suffice?  I haven't tested it with the
spinlock debug patch, but I have booted and run it with no apparent
problems.

Patch is against 2.5 ameslab bk.

Nathan
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