[S390] monwriter: Serialization bug for multithreaded applications.
[S390] monwriter: Serialization bug for multithreaded applications.

Locking added so that multithreaded applications can now do writes
from different threads without the risk of storage corruption.

Signed-off-by: Melissa Howland <9c451cfb9d2d44be8f1007f3b40a20db8783cac2@us.ibm.com>
Signed-off-by: Martin Schwidefsky <52616596d8f5df0d597e85ab515377f92f939c68@de.ibm.com>

KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas