target/tcm_loop: Replace a waitqueue and a counter by a completion
This patch simplifies the implementation of the tcm_loop driver but does not change its behavior. Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Hannes Reinecke <hare@suse.com> Cc: David Disseldorp <ddiss@suse.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
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