When CONFIG_IPV6 is not set, then the linking of the lan966x driver
fails with the following error:

drivers/net/ethernet/microchip/lan966x/lan966x_main.c:444: undefined
reference to `ipv6_mc_check_mld'

The fix consists in adding a check also for IS_ENABLED(CONFIG_IPV6)

Fixes: 47aeea0d57e80c ("net: lan966x: Implement the callback SWITCHDEV_ATTR_ID_BRIDGE_MC_DISABLED")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com>
---
v1->v2:
- use IS_ENABLED(CONFIG_IPV6) instead of #ifdef
---
 drivers/net/ethernet/microchip/lan966x/lan966x_main.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_main.c b/drivers/net/ethernet/microchip/lan966x/lan966x_main.c
index d62484f14564..4e877d9859bf 100644
--- a/drivers/net/ethernet/microchip/lan966x/lan966x_main.c
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_main.c
@@ -439,7 +439,8 @@ static bool lan966x_hw_offload(struct lan966x *lan966x, u32 port,
 	    ip_hdr(skb)->protocol == IPPROTO_IGMP)
 		return false;
 
-	if (skb->protocol == htons(ETH_P_IPV6) &&
+	if (IS_ENABLED(CONFIG_IPV6) &&
+	    skb->protocol == htons(ETH_P_IPV6) &&
 	    ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr) &&
 	    !ipv6_mc_check_mld(skb))
 		return false;
-- 
2.33.0

Hello:

This patch was applied to netdev/net-next.git (master)
by David S. Miller <davem@davemloft.net>:

On Sat, 12 Feb 2022 21:03:43 +0100 you wrote:
> When CONFIG_IPV6 is not set, then the linking of the lan966x driver
> fails with the following error:
> 
> drivers/net/ethernet/microchip/lan966x/lan966x_main.c:444: undefined
> reference to `ipv6_mc_check_mld'
> 
> The fix consists in adding a check also for IS_ENABLED(CONFIG_IPV6)
> 
> [...]

Here is the summary with links:
  - [net-next,v2] net: lan966x: Fix when CONFIG_IPV6 is not set
    https://git.kernel.org/netdev/net-next/c/867b1db874c9

You are awesome, thank you!
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