iscsi-target: Only perform wait_for_tasks when performing shutdown
authorNicholas Bellinger <nab@linux-iscsi.org>
Thu, 3 Oct 2013 20:37:21 +0000 (13:37 -0700)
committerNicholas Bellinger <nab@linux-iscsi.org>
Thu, 3 Oct 2013 21:22:44 +0000 (14:22 -0700)
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.

Cc: stable@vger.kernel.org # 3.10+
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
drivers/target/iscsi/iscsi_target_util.c

index f2de28e178fd738cd93dce94ad7980422749f9d2..b0cac0c342e1e83a9da5dc7b5f01edd48cb12136 100644 (file)
@@ -736,7 +736,7 @@ void iscsit_free_cmd(struct iscsi_cmd *cmd, bool shutdown)
                 * 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);
@@ -752,7 +752,7 @@ void iscsit_free_cmd(struct iscsi_cmd *cmd, bool shutdown)
                        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);