[PATCH 08/10] scsi: iscsi: Fix nop handling during conn recovery

Mike Christie
2022-04-08T00:13:46Z

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.

Reviewed-by: Lee Duncan <lduncan@suse.com>
Signed-off-by: Mike Christie <michael.christie@oracle.com>
---
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 5e7bd5a3b430..0bf8cf8585bb 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
@@ -3318,6 +3321,8 @@ 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 84086c240228..d0a24779c52d 100644
--- a/include/scsi/libiscsi.h
+++ b/include/scsi/libiscsi.h
@@ -56,7 +56,7 @@ 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
--
2.25.1