From: Glauber Costa <redacted>
Date: Fri, 16 Dec 2011 14:51:59 +0400

We can't scan the proto_list to initialize sock cgroups, as it
holds a rwlock, and we also want to keep the code generic enough to
avoid calling the initialization functions of protocols directly,

Convert proto_list_lock into a mutex, so we can sleep and do the
necessary allocations. This lock is seldom taken, so there shouldn't
be any performance penalties associated with that

Signed-off-by: Glauber Costa <redacted>

Applied.
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