[SCSI] megaraid_mbox: use mutex instead of semaphore
The Megaraid Mailbox driver uses a semaphore as mutex. Use the mutex API instead of the (binary) semaphore. Signed-off-by: NMatthias Kaehlcke <matthias.kaehlcke@gmail.com> Acked-by: N"Patro, Sumant" <Sumant.Patro@lsi.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NJames Bottomley <James.Bottomley@SteelEye.com>
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