[PATCH net 5/9] net/smc: recvmsg and splice_read should return 0 after shutdown

[Ursula Braun]

From: Karsten Graul <kgr...@linux.ibm.com>

When a socket was connected and is now shut down for read, return 0 to
indicate end of data in recvmsg and splice_read (like TCP) and do not
return ENOTCONN. This behavior is required by the socket api.

Signed-off-by: Karsten Graul <kgr...@linux.ibm.com>
Signed-off-by: Ursula Braun <ubr...@linux.ibm.com>
---
 net/smc/af_smc.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c
index c4e56602e0c6..b04a813fc865 100644
--- a/net/smc/af_smc.c
+++ b/net/smc/af_smc.c
@@ -1505,6 +1505,11 @@ static int smc_recvmsg(struct socket *sock, struct 
msghdr *msg, size_t len,
 
        smc = smc_sk(sk);
        lock_sock(sk);
+       if (sk->sk_state == SMC_CLOSED && (sk->sk_shutdown & RCV_SHUTDOWN)) {
+               /* socket was connected before, no more data to read */
+               rc = 0;
+               goto out;
+       }
        if ((sk->sk_state == SMC_INIT) ||
            (sk->sk_state == SMC_LISTEN) ||
            (sk->sk_state == SMC_CLOSED))
@@ -1840,7 +1845,11 @@ static ssize_t smc_splice_read(struct socket *sock, 
loff_t *ppos,
 
        smc = smc_sk(sk);
        lock_sock(sk);
-
+       if (sk->sk_state == SMC_CLOSED && (sk->sk_shutdown & RCV_SHUTDOWN)) {
+               /* socket was connected before, no more data to read */
+               rc = 0;
+               goto out;
+       }
        if (sk->sk_state == SMC_INIT ||
            sk->sk_state == SMC_LISTEN ||
            sk->sk_state == SMC_CLOSED)
-- 
2.16.4