[PATCH v5 9/9] scsi: target: iscsi: handle abort for WRITE_PENDING cmds

[Mike Christie <michael.christie@oracle.com>]

From: Dmitry Bogdanov <d.bogdanov@yadro.com>

Sometimes an initiator does not send data for WRITE commands and tries
to abort it. The abort hangs waiting for frontend driver completion.
iSCSI driver waits for for data and that timeout eventually initiates
connection reinstatment. The connection closing releases the commands in
the connection, but those aborted commands still did not handle the
abort and did not decrease a command ref counter. Because of that the
connection reinstatement hangs indefinitely and prevents re-login for
that initiator.

This patch adds a handling in TCM of the abort for the WRITE_PENDING
commands at connection closing moment to make it possible to release
them.

Signed-off-by: Dmitry Bogdanov <d.bogdanov@yadro.com>
[Rebase and expand comment]
Signed-off-by: Mike Christie <michael.christie@oracle.com>
---
 drivers/target/iscsi/iscsi_target.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/target/iscsi/iscsi_target.c b/drivers/target/iscsi/iscsi_target.c
index 07e196b44b91..834cce50f9b0 100644
--- a/drivers/target/iscsi/iscsi_target.c
+++ b/drivers/target/iscsi/iscsi_target.c
@@ -26,6 +26,7 @@
 #include <target/target_core_base.h>
 #include <target/target_core_fabric.h>
 
+#include <target/target_core_backend.h>
 #include <target/iscsi/iscsi_target_core.h>
 #include "iscsi_target_parameters.h"
 #include "iscsi_target_seq_pdu_list.h"
@@ -4236,6 +4237,16 @@ static void iscsit_release_commands_from_conn(struct iscsit_conn *conn)
 		} else {
 			se_cmd->transport_state |= CMD_T_FABRIC_STOP;
 		}
+
+		if (cmd->se_cmd.t_state == TRANSPORT_WRITE_PENDING) {
+			/*
+			 * We never submitted the cmd to LIO core, so we have
+			 * to tell LIO to perform the completion process.
+			 */
+			spin_unlock_irq(&se_cmd->t_state_lock);
+			target_complete_cmd(&cmd->se_cmd, SAM_STAT_TASK_ABORTED);
+			continue;
+		}
 		spin_unlock_irq(&se_cmd->t_state_lock);
 	}
 	spin_unlock_bh(&conn->cmd_lock);
-- 
2.25.1