rocker: fix maybe-uninitialized warning

In some rare configurations, we get a warning about the 'index' variable
being used without an initialization:

drivers/net/ethernet/rocker/rocker_ofdpa.c: In function ‘ofdpa_port_fib_ipv4.isra.16.constprop’:
drivers/net/ethernet/rocker/rocker_ofdpa.c:2425:92: warning: ‘index’ may be used uninitialized in this function [-Wmaybe-uninitialized]

This is a false positive, the logic is just a bit too complex for gcc
to follow here. Moving the intialization of 'index' a little further
down makes it clear to gcc that the function always returns an error
if it is not initialized.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/rocker/rocker_ofdpa.c b/drivers/net/ethernet/rocker/rocker_ofdpa.c
index 431a608..4ca4613 100644 (file)
--- a/drivers/net/ethernet/rocker/rocker_ofdpa.c
+++ b/drivers/net/ethernet/rocker/rocker_ofdpa.c
@@ -1493,8 +1493,6 @@ static int ofdpa_port_ipv4_nh(struct ofdpa_port *ofdpa_port,
        spin_lock_irqsave(&ofdpa->neigh_tbl_lock, lock_flags);
 
        found = ofdpa_neigh_tbl_find(ofdpa, ip_addr);
-       if (found)
-               *index = found->index;
 
        updating = found && adding;
        removing = found && !adding;
@@ -1508,9 +1506,11 @@ static int ofdpa_port_ipv4_nh(struct ofdpa_port *ofdpa_port,
                resolved = false;
        } else if (removing) {
                ofdpa_neigh_del(trans, found);
+               *index = found->index;
        } else if (updating) {
                ofdpa_neigh_update(found, trans, NULL, false);
                resolved = !is_zero_ether_addr(found->eth_dst);
+               *index = found->index;
        } else {
                err = -ENOENT;
        }