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| author | Mike Christie <michael.christie@oracle.com> | 2021-05-25 13:17:55 -0500 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2021-06-02 01:28:19 -0400 |
| commit | 891e2639deae721dc43764a44fa255890dc34313 (patch) | |
| tree | 330dde25d78117fd56298b4e8eed8e74fabffd2f /drivers/scsi/scsi_transport_iscsi.c | |
| parent | 1486a4f5c2f35da5743b56037b8bbfb4eb38fa61 (diff) | |
| download | lwn-891e2639deae721dc43764a44fa255890dc34313.tar.gz lwn-891e2639deae721dc43764a44fa255890dc34313.zip | |
scsi: iscsi: Stop queueing during ep_disconnect
During ep_disconnect we have been doing iscsi_suspend_tx/queue to block new
I/O but every driver except cxgbi and iscsi_tcp can still get I/O from
__iscsi_conn_send_pdu() if we haven't called iscsi_conn_failure() before
ep_disconnect. This could happen if we were terminating the session, and
the logout timed out before it was even sent to libiscsi.
Fix the issue by adding a helper which reverses the bind_conn call that
allows new I/O to be queued. Drivers implementing ep_disconnect can use this
to make sure new I/O is not queued to them when handling the disconnect.
Link: https://lore.kernel.org/r/20210525181821.7617-3-michael.christie@oracle.com
Reviewed-by: Lee Duncan <lduncan@suse.com>
Signed-off-by: Mike Christie <michael.christie@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/scsi_transport_iscsi.c')
| -rw-r--r-- | drivers/scsi/scsi_transport_iscsi.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/drivers/scsi/scsi_transport_iscsi.c b/drivers/scsi/scsi_transport_iscsi.c index 441f0152193f..82491343e94a 100644 --- a/drivers/scsi/scsi_transport_iscsi.c +++ b/drivers/scsi/scsi_transport_iscsi.c @@ -2964,7 +2964,7 @@ release_host: } static int iscsi_if_ep_disconnect(struct iscsi_transport *transport, - u64 ep_handle) + u64 ep_handle, bool is_active) { struct iscsi_cls_conn *conn; struct iscsi_endpoint *ep; @@ -2981,6 +2981,8 @@ static int iscsi_if_ep_disconnect(struct iscsi_transport *transport, conn->ep = NULL; mutex_unlock(&conn->ep_mutex); conn->state = ISCSI_CONN_FAILED; + + transport->unbind_conn(conn, is_active); } transport->ep_disconnect(ep); @@ -3012,7 +3014,8 @@ iscsi_if_transport_ep(struct iscsi_transport *transport, break; case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT: rc = iscsi_if_ep_disconnect(transport, - ev->u.ep_disconnect.ep_handle); + ev->u.ep_disconnect.ep_handle, + false); break; } return rc; @@ -3737,7 +3740,7 @@ iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group) conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid); if (conn && conn->ep) - iscsi_if_ep_disconnect(transport, conn->ep->id); + iscsi_if_ep_disconnect(transport, conn->ep->id, true); if (!session || !conn) { err = -EINVAL; @@ -4656,6 +4659,7 @@ iscsi_register_transport(struct iscsi_transport *tt) int err; BUG_ON(!tt); + WARN_ON(tt->ep_disconnect && !tt->unbind_conn); priv = iscsi_if_transport_lookup(tt); if (priv) |