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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Rahul Kundu <rahul.kundu@chelsio.com>,
        Mike Marciniszyn <mike.marciniszyn@intel.com>,
        Sagi Grimberg <sagi@grimberg.me>,
        Dakshaja Uppalapati <dakshaja@chelsio.com>,
        Bart Van Assche <bvanassche@acm.org>,
        "Martin K. Petersen" <martin.petersen@oracle.com>
Subject: [PATCH 4.19 81/97] scsi: Revert "target: iscsi: Wait for all commands to finish before freeing a session"
Date:   Thu, 27 Feb 2020 14:37:29 +0100
Message-Id: <20200227132227.672661073@linuxfoundation.org>
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From: Bart Van Assche <bvanassche@acm.org>

commit 807b9515b7d044cf77df31f1af9d842a76ecd5cb upstream.

Since commit e9d3009cb936 introduced a regression and since the fix for
that regression was not perfect, revert this commit.

Link: https://marc.info/?l=target-devel&m=158157054906195
Cc: Rahul Kundu <rahul.kundu@chelsio.com>
Cc: Mike Marciniszyn <mike.marciniszyn@intel.com>
Cc: Sagi Grimberg <sagi@grimberg.me>
Reported-by: Dakshaja Uppalapati <dakshaja@chelsio.com>
Fixes: e9d3009cb936 ("scsi: target: iscsi: Wait for all commands to finish before freeing a session")
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/target/iscsi/iscsi_target.c |   10 ++--------
 include/scsi/iscsi_proto.h          |    1 -
 2 files changed, 2 insertions(+), 9 deletions(-)

--- a/drivers/target/iscsi/iscsi_target.c
+++ b/drivers/target/iscsi/iscsi_target.c
@@ -1157,9 +1157,7 @@ int iscsit_setup_scsi_cmd(struct iscsi_c
 		hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
 		conn->cid);
 
-	if (target_get_sess_cmd(&cmd->se_cmd, true) < 0)
-		return iscsit_add_reject_cmd(cmd,
-				ISCSI_REASON_WAITING_FOR_LOGOUT, buf);
+	target_get_sess_cmd(&cmd->se_cmd, true);
 
 	cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
 						     scsilun_to_int(&hdr->lun));
@@ -2000,9 +1998,7 @@ iscsit_handle_task_mgt_cmd(struct iscsi_
 			      conn->sess->se_sess, 0, DMA_NONE,
 			      TCM_SIMPLE_TAG, cmd->sense_buffer + 2);
 
-	if (target_get_sess_cmd(&cmd->se_cmd, true) < 0)
-		return iscsit_add_reject_cmd(cmd,
-				ISCSI_REASON_WAITING_FOR_LOGOUT, buf);
+	target_get_sess_cmd(&cmd->se_cmd, true);
 
 	/*
 	 * TASK_REASSIGN for ERL=2 / connection stays inside of
@@ -4208,8 +4204,6 @@ int iscsit_close_connection(
 	 * must wait until they have completed.
 	 */
 	iscsit_check_conn_usage_count(conn);
-	target_sess_cmd_list_set_waiting(sess->se_sess);
-	target_wait_for_sess_cmds(sess->se_sess);
 
 	ahash_request_free(conn->conn_tx_hash);
 	if (conn->conn_rx_hash) {
--- a/include/scsi/iscsi_proto.h
+++ b/include/scsi/iscsi_proto.h
@@ -638,7 +638,6 @@ struct iscsi_reject {
 #define ISCSI_REASON_BOOKMARK_INVALID	9
 #define ISCSI_REASON_BOOKMARK_NO_RESOURCES	10
 #define ISCSI_REASON_NEGOTIATION_RESET	11
-#define ISCSI_REASON_WAITING_FOR_LOGOUT	12
 
 /* Max. number of Key=Value pairs in a text message */
 #define MAX_KEY_VALUE_PAIRS	8192