All these files use the big kernel lock in a trivial
way to serialize their private file operations,
typically resulting from an earlier semi-automatic
pushdown from VFS.
None of these drivers appears to want to lock against
other code, and they all use the BKL as the top-level
lock in their file
This is a repost of an earlier patch to remove
those users of the big kernel lock that can be
converted to a mutex using a simple script.
The only use of the BKL is in file operations
that are called without any other lock, so the
new mutex is the top-level serialization
and cannot introduce any
