net: Add FLOWI_FLAG_CAN_SLEEP.

And set is in contexts where the route resolution can sleep.

Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c
index e185765..e8e8613 100644
--- a/net/ipv4/raw.c
+++ b/net/ipv4/raw.c
@@ -555,7 +555,8 @@
 				    .fl4_tos = tos,
 				    .proto = inet->hdrincl ? IPPROTO_RAW :
 							     sk->sk_protocol,
-				  };
+				    .flags = FLOWI_FLAG_CAN_SLEEP,
+		};
 		if (!inet->hdrincl) {
 			err = raw_probe_proto_opt(&fl, msg);
 			if (err)