tree 754edbf66f6d27b25ac6816e986669cca14c504a
parent 0a87c5cfc0bb0c1bdcc1cc9fd82e4a1711fac512
author Michael Holzheu <holzheu@de.ibm.com> 1187783501 +0200
committer Martin Schwidefsky <schwidefsky@de.ibm.com> 1187783508 +0200

[S390] vmur: fix reference counting for vmur device structure

When a vmur device is removed due to a detach of the device, currently the
ur device structure is freed. Unfortunately it can happen, that there is
still a user of the device structure, when the character device is open
during the detach process. To fix this, reference counting for the vmur
structure is introduced.
In addition to that, the online, offline, probe and remove functions are
serialized now using a global mutex.

Signed-off-by: Michael Holzheu <holzheu@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>