[ 109/135] iscsi-target: Only perform wait_for_tasks when performing shutdown

[Greg Kroah-Hartman]

3.11-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>

commit e255a28598e8e63070322fc89bd34189dd660a89 upstream.

This patch changes transport_generic_free_cmd() to only wait_for_tasks
when shutdown=true is passed to iscsit_free_cmd().

With the advent of >= v3.10 iscsi-target code using se_cmd->cmd_kref,
the extra wait_for_tasks with shutdown=false is unnecessary, and may
end up causing an extra context switch when releasing WRITEs.

Signed-off-by: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/target/iscsi/iscsi_target_util.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/target/iscsi/iscsi_target_util.c
+++ b/drivers/target/iscsi/iscsi_target_util.c
@@ -735,7 +735,7 @@ void iscsit_free_cmd(struct iscsi_cmd *c
 		 * Fallthrough
 		 */
 	case ISCSI_OP_SCSI_TMFUNC:
-		rc = transport_generic_free_cmd(&cmd->se_cmd, 1);
+		rc = transport_generic_free_cmd(&cmd->se_cmd, shutdown);
 		if (!rc && shutdown && se_cmd && se_cmd->se_sess) {
 			__iscsit_free_cmd(cmd, true, shutdown);
 			target_put_sess_cmd(se_cmd->se_sess, se_cmd);
@@ -751,7 +751,7 @@ void iscsit_free_cmd(struct iscsi_cmd *c
 			se_cmd = &cmd->se_cmd;
 			__iscsit_free_cmd(cmd, true, shutdown);
 
-			rc = transport_generic_free_cmd(&cmd->se_cmd, 1);
+			rc = transport_generic_free_cmd(&cmd->se_cmd, shutdown);
 			if (!rc && shutdown && se_cmd->se_sess) {
 				__iscsit_free_cmd(cmd, true, shutdown);
 				target_put_sess_cmd(se_cmd->se_sess, se_cmd);


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