From: Daniel Borkmann <daniel@iogearbox.net>
Date: Thu, 24 Aug 2017 03:20:11 +0200
Subject: bpf: netdev is never null in __dev_map_flush
Patch-mainline: v4.14-rc1
Git-commit: a5e2da6e9787187ff104c34aa048419703c1f9cb
References: bsc#1109837

No need to test for it in fast-path, every dev in bpf_dtab_netdev
is guaranteed to be non-NULL, otherwise dev_map_update_elem() will
fail in the first place.

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 kernel/bpf/devmap.c |    8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

--- a/kernel/bpf/devmap.c
+++ b/kernel/bpf/devmap.c
@@ -226,12 +226,10 @@ void __dev_map_flush(struct bpf_map *map
 		if (unlikely(!dev))
 			continue;
 
-		netdev = dev->dev;
 		__clear_bit(bit, bitmap);
-		if (unlikely(!netdev || !netdev->netdev_ops->ndo_xdp_flush))
-			continue;
-
-		netdev->netdev_ops->ndo_xdp_flush(netdev);
+		netdev = dev->dev;
+		if (likely(netdev->netdev_ops->ndo_xdp_flush))
+			netdev->netdev_ops->ndo_xdp_flush(netdev);
 	}
 }