FCP transactions as well as CMP transactions were serialized with
mutex_lock_interruptible. It is extremely unlikly though that a signal
will arrive while a concurrent process holds the mutex. And even if one
does, the duration of a transaction is reasonably short (1.2 seconds if
all retries time out, usually much shorter).
Hence simplify the code to plain mutex_lock.
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
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