tree ab60a16d9c19efc26e5a9253bcf96703cd1b65b7
parent bc29b7ac1d9f09f5024b0e257e91bf5df611ccd4
author Sebastian Ott <sebott@linux.vnet.ibm.com> 1468917806 +0200
committer Martin Schwidefsky <schwidefsky@de.ibm.com> 1469957277 -0400

s390/cio: convert cfg_lock mutex to spinlock

cfg_lock is never held long and we don't want to sleep while the
lock is being held. Thus it can be converted to a simple spinlock.
In addition we can now use the lock during the evaluation of a
wake_up condition.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Reviewed-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>