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[SCSI] iscsi_tcp: Evaluate socket state in data_ready()

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The network core will call the state_change() callback
prior to the data_ready() callback, which might cause
us to lose a connection state change.
So we have to evaluate the socket state at the end
of the data_ready() callback, too.

Signed-off-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
This commit is contained in:
Hannes Reinecke 2009-08-20 15:10:57 -05:00 committed by James Bottomley
parent ac280b670e
commit 523eeac670
1 changed files with 25 additions and 3 deletions
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28
drivers/scsi/iscsi_tcp.c
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@ -99,6 +99,24 @@ static int iscsi_sw_tcp_recv(read_descriptor_t *rd_desc, struct sk_buff *skb,
return total_consumed;
}
/**
* iscsi_sw_sk_state_check - check socket state
* @sk: socket
*
* If the socket is in CLOSE or CLOSE_WAIT we should
* not close the connection if there is still some
* data pending.
*/
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;
return 0;
}
static void iscsi_sw_tcp_data_ready(struct sock *sk, int flag)
{
struct iscsi_conn *conn = sk->sk_user_data;
@ -117,6 +135,12 @@ 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);
}
read_unlock(&sk->sk_callback_lock);
/* If we had to (atomically) map a highmem page,
@ -137,9 +161,7 @@ static void iscsi_sw_tcp_state_change(struct sock *sk)
conn = (struct iscsi_conn*)sk->sk_user_data;
session = conn->session;
if ((sk->sk_state == TCP_CLOSE_WAIT ||
sk->sk_state == TCP_CLOSE) &&
!atomic_read(&sk->sk_rmem_alloc)) {
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);