tree 62e413692d4c55ae322c3201c36ded4808806cb5
parent 63f4f9e1281ea9b9a2304bd13d657ba9d401c9a7
author Cornelia Huck <cornelia.huck@de.ibm.com> 1152715190 +0200
committer Martin Schwidefsky <schwidefsky@de.ibm.com> 1152715190 +0200

[S390] subchannel register/unregister mutex.

Add a reg_mutex to prevent unregistering a subchannel before it has been
registered. Since 2.6.17, we've seen oopses in kslowcrw when a device is
found to be not operational during sense id when doing initial device
recognition; it is not clear yet why that particular problem was not (yet)
observed with earlier kernels...

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>