[PATCH net] rxrpc: Fix sendmsg() returning EPIPE due to recvmsg() returning ENODATA

[David Howells]

rxrpc_sendmsg() returns EPIPE if there's an outstanding error, such as if
rxrpc_recvmsg() indicating ENODATA if there's nothing for it to read.

Change rxrpc_recvmsg() to return EAGAIN instead if there's nothing to read
as this particular error doesn't get stored in ->sk_err by the networking
core.

Also change rxrpc_sendmsg() so that it doesn't fail with delayed receive
errors (there's no way for it to report which call, if any, the error was
caused by).

Fixes: 17926a79320a ("[AF_RXRPC]: Provide secure RxRPC sockets for use by 
userspace and kernel both")
Signed-off-by: David Howells <dhowe...@redhat.com>
---

 net/rxrpc/recvmsg.c |    2 +-
 net/rxrpc/sendmsg.c |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/rxrpc/recvmsg.c b/net/rxrpc/recvmsg.c
index 2989742a4aa1..490b1927215c 100644
--- a/net/rxrpc/recvmsg.c
+++ b/net/rxrpc/recvmsg.c
@@ -543,7 +543,7 @@ int rxrpc_recvmsg(struct socket *sock, struct msghdr *msg, 
size_t len,
            list_empty(&rx->recvmsg_q) &&
            rx->sk.sk_state != RXRPC_SERVER_LISTENING) {
                release_sock(&rx->sk);
-               return -ENODATA;
+               return -EAGAIN;
        }
 
        if (list_empty(&rx->recvmsg_q)) {
diff --git a/net/rxrpc/sendmsg.c b/net/rxrpc/sendmsg.c
index 1304b8608f56..03a30d014bb6 100644
--- a/net/rxrpc/sendmsg.c
+++ b/net/rxrpc/sendmsg.c
@@ -304,7 +304,7 @@ static int rxrpc_send_data(struct rxrpc_sock *rx,
        /* this should be in poll */
        sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk);
 
-       if (sk->sk_err || (sk->sk_shutdown & SEND_SHUTDOWN))
+       if (sk->sk_shutdown & SEND_SHUTDOWN)
                return -EPIPE;
 
        more = msg->msg_flags & MSG_MORE;