staging: unisys: Lock visorchannels associated with devices
staging: unisys: Lock visorchannels associated with devices

A visorchannel associated with a device should have its writing to
the channel protected by a lock.

Fixes: b32c4997c ('staging: unisys: Move channel creation up the stack')
Signed-off-by: Tim Sell <86d8eb109fa687c9e00a3835bb4d60f543689470@unisys.com>
Signed-off-by: Benjamin Romer <aa4f04c7a9e9354d8d7625bad3543e518d310003@unisys.com>
Signed-off-by: David Kershner <af0edbfd86cb4475cb78945d4335593dfc15eead@unisys.com>
Signed-off-by: Greg Kroah-Hartman <4645f7897fd33786a2ee1264d590b3c400559d85@linuxfoundation.org>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs