[PATCH 5.12 187/363] scsi: qla2xxx: Prevent PRLI in target mode

[Greg Kroah-Hartman]

From: Anastasia Kovaleva <a.kovaleva@xxxxxxxxx>

[ Upstream commit fcb16d9a8ecf1e9bfced0fc654ea4e2caa7517f4 ]

In a case when the initiator in P2P mode by some circumstances does not
send PRLI, the target, in a case when the target port's WWPN is less than
initiator's, changes the discovery state in DSC_GNL. When gnl completes it
sends PRLI to the initiator.

Usually the initiator in P2P mode always sends PRLI. We caught this issue
on Linux stable v5.4.6 https://www.spinics.net/lists/stable/msg458515.html.

Fix this particular corner case in the behaviour of the P2P mod target
login state machine.

Link: https://lore.kernel.org/r/20210422153414.4022-1-a.kovaleva@xxxxxxxxx
Fixes: a9ed06d4e640 ("scsi: qla2xxx: Allow PLOGI in target mode")
Reviewed-by: Roman Bolshakov <r.bolshakov@xxxxxxxxx>
Reviewed-by: Himanshu Madhani <himanshu.madhani@xxxxxxxxxx>
Signed-off-by: Anastasia Kovaleva <a.kovaleva@xxxxxxxxx>
Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/scsi/qla2xxx/qla_init.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/scsi/qla2xxx/qla_init.c b/drivers/scsi/qla2xxx/qla_init.c
index f01f07116bd3..8cb0574cfa91 100644
--- a/drivers/scsi/qla2xxx/qla_init.c
+++ b/drivers/scsi/qla2xxx/qla_init.c
@@ -1194,6 +1194,9 @@ static int qla24xx_post_prli_work(struct scsi_qla_host *vha, fc_port_t *fcport)
 {
 	struct qla_work_evt *e;
 
+	if (vha->host->active_mode == MODE_TARGET)
+		return QLA_FUNCTION_FAILED;
+
 	e = qla2x00_alloc_work(vha, QLA_EVT_PRLI);
 	if (!e)
 		return QLA_FUNCTION_FAILED;
-- 
2.30.2