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[POWERPC] fix spin lock nesting in hvc_iseries
We had nested spinlocks using the same flags variable, but it turns out that we don't need the nested locks at all (the lock protects a static buffer that we aren't using here), so just remove the extra locks. Spotted by Alexey Dobriyan. Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Paul Mackerras <paulus@samba.org>
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