linux-kernel - [PATCH 4.2 020/258] iser-target: remove command with state ISTATE

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Message-Id: <20151018014731.223195813@linuxfoundation.org>
Date:	Sat, 17 Oct 2015 18:55:33 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Jenny Derzhavetz <jennyf@...lanox.com>,
	Sagi Grimberg <sagig@...lanox.com>,
	Nicholas Bellinger <nab@...ux-iscsi.org>
Subject: [PATCH 4.2 020/258] iser-target: remove command with state ISTATE_REMOVE

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

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

From: Jenny Derzhavetz <jennyf@...lanox.com>

commit a4c15cd957cbd728f685645de7a150df5912591a upstream.

As documented in iscsit_sequence_cmd:
/*
 * Existing callers for iscsit_sequence_cmd() will silently
 * ignore commands with CMDSN_LOWER_THAN_EXP, so force this
 * return for CMDSN_MAXCMDSN_OVERRUN as well..
 */

We need to silently finish a command when it's in ISTATE_REMOVE.
This fixes an teardown hang we were seeing where a mis-behaved
initiator (triggered by allocation error injections) sent us a
cmdsn which was lower than expected.

Signed-off-by: Jenny Derzhavetz <jennyf@...lanox.com>
Signed-off-by: Sagi Grimberg <sagig@...lanox.com>
Signed-off-by: Nicholas Bellinger <nab@...ux-iscsi.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/infiniband/ulp/isert/ib_isert.c |    9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

--- a/drivers/infiniband/ulp/isert/ib_isert.c
+++ b/drivers/infiniband/ulp/isert/ib_isert.c
@@ -3012,9 +3012,16 @@ isert_get_dataout(struct iscsi_conn *con
 static int
 isert_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
 {
-	int ret;
+	struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
+	int ret = 0;
 
 	switch (state) {
+	case ISTATE_REMOVE:
+		spin_lock_bh(&conn->cmd_lock);
+		list_del_init(&cmd->i_conn_node);
+		spin_unlock_bh(&conn->cmd_lock);
+		isert_put_cmd(isert_cmd, true);
+		break;
 	case ISTATE_SEND_NOPIN_WANT_RESPONSE:
 		ret = isert_put_nopin(cmd, conn, false);
 		break;


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