tree 5426526ca602c9394d3501cf15cf61fa5acc2695
parent 279b8f9a0f3ea3399764047d487dfdd8f7bc9795
author Sebastian Ott <sebott@linux.vnet.ibm.com> 1442315502 +0200
committer Martin Schwidefsky <schwidefsky@de.ibm.com> 1444825922 +0200

s390/cio: use device_lock during cmb activation

Hold the device_lock during [de]activation of the channel measurement
block to synchronize concurrent usage of these functions.

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