SUNRPC: fix race to sk_err after xs_error_report

Since commit 4f8943f80883 ("SUNRPC: Replace direct task wakeups from
softirq context") there has been a race to the value of the sk_err if both
XPRT_SOCK_WAKE_ERROR and XPRT_SOCK_WAKE_DISCONNECT are set.  In that case,
we may end up losing the sk_err value that existed when xs_error_report was
called.

Fix this by reverting to the previous behavior: instead of using SO_ERROR
to retrieve the value at a later time (which might also return sk_err_soft),
copy the sk_err value onto struct sock_xprt, and use that value to wake
pending tasks.

Signed-off-by: Benjamin Coddington <bcodding@redhat.com>
Fixes: 4f8943f80883 ("SUNRPC: Replace direct task wakeups from softirq context")
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

1 files changed, 8 insertions, 9 deletions

diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c
index 9ac88722fa83..70e52f567b2a 100644
--- a/net/sunrpc/xprtsock.c
+++ b/net/sunrpc/xprtsock.c
@@ -1249,19 +1249,21 @@ static void xs_error_report(struct sock *sk)
 {
         struct sock_xprt *transport;
         struct rpc_xprt *xprt;
-        int err;
 
         read_lock_bh(&sk->sk_callback_lock);
         if (!(xprt = xprt_from_sock(sk)))
                 goto out;
 
         transport = container_of(xprt, struct sock_xprt, xprt);
-        err = -sk->sk_err;
-        if (err == 0)
+        transport->xprt_err = -sk->sk_err;
+        if (transport->xprt_err == 0)
                 goto out;
         dprintk("RPC:       xs_error_report client %p, error=%d...\n",
-                        xprt, -err);
-        trace_rpc_socket_error(xprt, sk->sk_socket, err);
+                        xprt, -transport->xprt_err);
+        trace_rpc_socket_error(xprt, sk->sk_socket, transport->xprt_err);
+
+        /* barrier ensures xprt_err is set before XPRT_SOCK_WAKE_ERROR */
+        smp_mb__before_atomic();
         xs_run_error_worker(transport, XPRT_SOCK_WAKE_ERROR);
  out:
         read_unlock_bh(&sk->sk_callback_lock);
@@ -2476,7 +2478,6 @@ static void xs_wake_write(struct sock_xprt *transport)
 static void xs_wake_error(struct sock_xprt *transport)
 {
         int sockerr;
-        int sockerr_len = sizeof(sockerr);
 
         if (!test_bit(XPRT_SOCK_WAKE_ERROR, &transport->sock_state))
                 return;
@@ -2485,9 +2486,7 @@ static void xs_wake_error(struct sock_xprt *transport)
                 goto out;
         if (!test_and_clear_bit(XPRT_SOCK_WAKE_ERROR, &transport->sock_state))
                 goto out;
-        if (kernel_getsockopt(transport->sock, SOL_SOCKET, SO_ERROR,
-                                (char *)&sockerr, &sockerr_len) != 0)
-                goto out;
+        sockerr = xchg(&transport->xprt_err, 0);
         if (sockerr < 0)
                 xprt_wake_pending_tasks(&transport->xprt, sockerr);
 out: