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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, Quinn Tran <qutran@marvell.com>,
        Himanshu Madhani <hmadhani@marvell.com>,
        "Martin K. Petersen" <martin.petersen@oracle.com>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 4.9 03/49] scsi: qla2xxx: Fix unbound sleep in fcport delete path.
Date:   Sun, 27 Oct 2019 22:00:41 +0100
Message-Id: <20191027203121.970264406@linuxfoundation.org>
In-Reply-To: <20191027203119.468466356@linuxfoundation.org>
References: <20191027203119.468466356@linuxfoundation.org>
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From: Quinn Tran <qutran@marvell.com>

[ Upstream commit c3b6a1d397420a0fdd97af2f06abfb78adc370df ]

There are instances, though rare, where a LOGO request cannot be sent out
and the thread in free session done can wait indefinitely. Fix this by
putting an upper bound to sleep.

Link: https://lore.kernel.org/r/20190912180918.6436-3-hmadhani@marvell.com
Signed-off-by: Quinn Tran <qutran@marvell.com>
Signed-off-by: Himanshu Madhani <hmadhani@marvell.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/scsi/qla2xxx/qla_target.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/scsi/qla2xxx/qla_target.c b/drivers/scsi/qla2xxx/qla_target.c
index 11f45cb998927..d13e91e164258 100644
--- a/drivers/scsi/qla2xxx/qla_target.c
+++ b/drivers/scsi/qla2xxx/qla_target.c
@@ -572,6 +572,7 @@ static void qlt_free_session_done(struct work_struct *work)
 
 	if (logout_started) {
 		bool traced = false;
+		u16 cnt = 0;
 
 		while (!ACCESS_ONCE(sess->logout_completed)) {
 			if (!traced) {
@@ -581,6 +582,9 @@ static void qlt_free_session_done(struct work_struct *work)
 				traced = true;
 			}
 			msleep(100);
+			cnt++;
+			if (cnt > 200)
+				break;
 		}
 
 		ql_dbg(ql_dbg_tgt_mgt, vha, 0xf087,
-- 
2.20.1