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 <Timothy.Sell@unisys.com>
Signed-off-by: Benjamin Romer <benjamin.romer@unisys.com>
Signed-off-by: David Kershner <david.kershner@unisys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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