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Replace spinlocks guarding gpio config ops with mutexes. This is a me-too patch, and is justifiable insofar as mutexes have stricter semantics and better debugging support, so are preferred where they are applicable. Signed-off-by: Jim Cromie <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>