[SCSI] iscsi_tcp: add new conn error to indicate tcp conn closed

If a target closed the connection, we will detect it in the
state_changed or data_ready callout. This adds a new conn
error value to use for this problem, so it is not confused
with when the initiator throws a conn error and drops
the connection.

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

1 files changed, 9 insertions, 14 deletions

diff --git a/drivers/scsi/iscsi_tcp.c b/drivers/scsi/iscsi_tcp.c
index c7e2ff24ee9e..2b1b834a098b 100644
--- a/drivers/scsi/iscsi_tcp.c
+++ b/drivers/scsi/iscsi_tcp.c
@@ -109,11 +109,14 @@ static int iscsi_sw_tcp_recv(read_descriptor_t *rd_desc, struct sk_buff *skb,
  */
 static inline int iscsi_sw_sk_state_check(struct sock *sk)
 {
-        if ((sk->sk_state == TCP_CLOSE_WAIT ||
-             sk->sk_state == TCP_CLOSE) &&
-            !atomic_read(&sk->sk_rmem_alloc))
-                return -ECONNRESET;
+        struct iscsi_conn *conn = (struct iscsi_conn*)sk->sk_user_data;
 
+        if ((sk->sk_state == TCP_CLOSE_WAIT || sk->sk_state == TCP_CLOSE) &&
+            !atomic_read(&sk->sk_rmem_alloc)) {
+                ISCSI_SW_TCP_DBG(conn, "TCP_CLOSE|TCP_CLOSE_WAIT\n");
+                iscsi_conn_failure(conn, ISCSI_ERR_TCP_CONN_CLOSE);
+                return -ECONNRESET;
+        }
         return 0;
 }
 
@@ -135,11 +138,7 @@ static void iscsi_sw_tcp_data_ready(struct sock *sk, int flag)
         rd_desc.count = 1;
         tcp_read_sock(sk, &rd_desc, iscsi_sw_tcp_recv);
 
-        if (iscsi_sw_sk_state_check(sk) < 0) {
-                ISCSI_SW_TCP_DBG(conn, "iscsi_tcp_data_ready: "
-                                 "TCP_CLOSE|TCP_CLOSE_WAIT\n");
-                iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
-        }
+        iscsi_sw_sk_state_check(sk);
 
         read_unlock(&sk->sk_callback_lock);
 
@@ -161,11 +160,7 @@ static void iscsi_sw_tcp_state_change(struct sock *sk)
         conn = (struct iscsi_conn*)sk->sk_user_data;
         session = conn->session;
 
-        if (iscsi_sw_sk_state_check(sk) < 0) {
-                ISCSI_SW_TCP_DBG(conn, "iscsi_tcp_state_change: "
-                                 "TCP_CLOSE|TCP_CLOSE_WAIT\n");
-                iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
-        }
+        iscsi_sw_sk_state_check(sk);
 
         tcp_conn = conn->dd_data;
         tcp_sw_conn = tcp_conn->dd_data;