target: Drop se_device TCQ queue_depth usage from I/O path

Historically, pSCSI devices have been the ones that required target-core
to enforce a per se_device->depth_left.  This patch changes target-core
to no longer (by default) enforce a per se_device->depth_left or sleep in
transport_tcq_window_closed() when we out of queue slots for all backend
export cases.

Cc: Christoph Hellwig <hch@lst.de>
Cc: Roland Dreier <roland@purestorage.com>
Cc: Joern Engel <joern@logfs.org>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

1 files changed, 0 insertions, 1 deletions

diff --git a/include/target/target_core_base.h b/include/target/target_core_base.h
index 28190dc10eef..cd4caf3a598f 100644
--- a/include/target/target_core_base.h
+++ b/include/target/target_core_base.h
@@ -798,7 +798,6 @@ struct se_device {
         spinlock_t              stats_lock;
         /* Active commands on this virtual SE device */
         atomic_t                simple_cmds;
-        atomic_t                depth_left;
         atomic_t                dev_ordered_id;
         atomic_t                execute_tasks;
         atomic_t                dev_ordered_sync;