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tipc: Fix missing connection request handling 

In filter_connect, we use waitqueue_active() to check for any
connections to wakeup. But waitqueue_active() is missing memory
barriers while accessing the critical sections, leading to
inconsistent results.

In this commit, we replace this with an SMP safe wq_has_sleeper()
using the generic socket callback sk_data_ready().

Signed-off-by: Parthasarathy Bhuvaragan <parthasarathy.bhuvaragan@ericsson.com>
Reviewed-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Parthasarathy Bhuvaragan 2017-04-26 10:05:00 +02:00 committed by David S. Miller
parent f83246089c
commit 42b531de17
1 changed files with 1 additions and 2 deletions
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3
net/tipc/socket.c
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@ -1581,8 +1581,7 @@ static bool filter_connect(struct tipc_sock *tsk, struct sk_buff *skb)
return true;
/* If empty 'ACK-' message, wake up sleeping connect() */
if (waitqueue_active(sk_sleep(sk)))
wake_up_interruptible(sk_sleep(sk));
sk->sk_data_ready(sk);
/* 'ACK-' message is neither accepted nor rejected: */
msg_set_dest_droppable(hdr, 1);