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rw_lock vs mutex

While digging around looking into another problem, I noticed that the piixpm(4) driver uses an rw_lock for its ic_acquire_bus/ic_release_bus routines. ic_acquire_bus() uses rw_enter(..., RW_WRITER) and there doesn't appear to be any use anywhere of RW_READER for that lock.

The man page for rw_lock implies that it is a superset of a mutex. So I'm wondering if it makes any sense to use the simpler mutex instead?

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