linux-kernel - [PATCH 5.17 080/146] scsi: iscsi: Fix NOP handling during conn recovery

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Message-Id: <20220426081752.311421282@linuxfoundation.org>
Date:   Tue, 26 Apr 2022 10:21:15 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Manish Rangankar <mrangankar@...vell.com>,
        Lee Duncan <lduncan@...e.com>, Chris Leech <cleech@...hat.com>,
        Mike Christie <michael.christie@...cle.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.17 080/146] scsi: iscsi: Fix NOP handling during conn recovery

From: Mike Christie <michael.christie@...cle.com>

[ Upstream commit 44ac97109e42f87b1a34954704b81b6c8eca80c4 ]

If a offload driver doesn't use the xmit workqueue, then when we are doing
ep_disconnect libiscsi can still inject PDUs to the driver. This adds a
check for if the connection is bound before trying to inject PDUs.

Link: https://lore.kernel.org/r/20220408001314.5014-9-michael.christie@oracle.com
Tested-by: Manish Rangankar <mrangankar@...vell.com>
Reviewed-by: Lee Duncan <lduncan@...e.com>
Reviewed-by: Chris Leech <cleech@...hat.com>
Signed-off-by: Mike Christie <michael.christie@...cle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/scsi/libiscsi.c | 7 ++++++-
 include/scsi/libiscsi.h | 2 +-
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c
index 073c4db79094..f228d991038a 100644
--- a/drivers/scsi/libiscsi.c
+++ b/drivers/scsi/libiscsi.c
@@ -678,7 +678,8 @@ __iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
 	struct iscsi_task *task;
 	itt_t itt;
 
-	if (session->state == ISCSI_STATE_TERMINATE)
+	if (session->state == ISCSI_STATE_TERMINATE ||
+	    !test_bit(ISCSI_CONN_FLAG_BOUND, &conn->flags))
 		return NULL;
 
 	if (opcode == ISCSI_OP_LOGIN || opcode == ISCSI_OP_TEXT) {
@@ -2214,6 +2215,8 @@ void iscsi_conn_unbind(struct iscsi_cls_conn *cls_conn, bool is_active)
 	iscsi_suspend_tx(conn);
 
 	spin_lock_bh(&session->frwd_lock);
+	clear_bit(ISCSI_CONN_FLAG_BOUND, &conn->flags);
+
 	if (!is_active) {
 		/*
 		 * if logout timed out before userspace could even send a PDU
@@ -3311,6 +3314,8 @@ int iscsi_conn_bind(struct iscsi_cls_session *cls_session,
 	spin_lock_bh(&session->frwd_lock);
 	if (is_leading)
 		session->leadconn = conn;
+
+	set_bit(ISCSI_CONN_FLAG_BOUND, &conn->flags);
 	spin_unlock_bh(&session->frwd_lock);
 
 	/*
diff --git a/include/scsi/libiscsi.h b/include/scsi/libiscsi.h
index bdb0ae11682d..d1e282f0d6f1 100644
--- a/include/scsi/libiscsi.h
+++ b/include/scsi/libiscsi.h
@@ -55,7 +55,7 @@ enum {
 /* Connection flags */
 #define ISCSI_CONN_FLAG_SUSPEND_TX	BIT(0)
 #define ISCSI_CONN_FLAG_SUSPEND_RX	BIT(1)
-
+#define ISCSI_CONN_FLAG_BOUND		BIT(2)
 
 #define ISCSI_ITT_MASK			0x1fff
 #define ISCSI_TOTAL_CMDS_MAX		4096
-- 
2.35.1