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Subject[PATCH 4.2 18/61] net: switchdev: fix return code of fdb_dump stub
4.2-stable review patch.  If anyone has any objections, please let me know.


From: Dragos Tatulea <>

[ Upstream commit 24cb7055a3066634a0f3fa0cd6a4780652905d35 ]

rtnl_fdb_dump always expects an index to be returned by the ndo_fdb_dump op,
but when CONFIG_NET_SWITCHDEV is off, it returns an error.

Fix that by returning the given unmodified idx.

A similar fix was 0890cf6cb6ab ("switchdev: fix return value of
switchdev_port_fdb_dump in case of error") but for the CONFIG_NET_SWITCHDEV=y

Fixes: 45d4122ca7cd ("switchdev: add support for fdb add/del/dump via switchdev_port_obj ops.")
Signed-off-by: Dragos Tatulea <>
Acked-by: Jiri Pirko <>
Signed-off-by: David S. Miller <>
Signed-off-by: Greg Kroah-Hartman <>
include/net/switchdev.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/include/net/switchdev.h
+++ b/include/net/switchdev.h
@@ -268,7 +268,7 @@ static inline int switchdev_port_fdb_dum
struct net_device *filter_dev,
int idx)
- return -EOPNOTSUPP;
+ return idx;


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