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1bc6664bdf
Hold the device_lock during [de]activation of the channel measurement block to synchronize concurrent usage of these functions. Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Reviewed-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>