netdev - [PATCH net v2] ice: Fix MAC address setting

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Date:   Fri, 25 Mar 2022 14:25:23 +0100
From:   Ivan Vecera <ivecera@...hat.com>
To:     netdev@...r.kernel.org
Cc:     poros@...hat.com, mschmidt@...hat.com,
        Jesse Brandeburg <jesse.brandeburg@...el.com>,
        Tony Nguyen <anthony.l.nguyen@...el.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        intel-wired-lan@...ts.osuosl.org (moderated list:INTEL ETHERNET DRIVERS),
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH net v2] ice: Fix MAC address setting

Commit 2ccc1c1ccc671b ("ice: Remove excess error variables") merged
the usage of 'status' and 'err' variables into single one in
function ice_set_mac_address(). Unfortunately this causes
a regression when call of ice_fltr_add_mac() returns -EEXIST because
this return value does not indicate an error in this case but
value of 'err' remains to be -EEXIST till the end of the function
and is returned to caller.

Prior mentioned commit this does not happen because return value of
ice_fltr_add_mac() was stored to 'status' variable first and
if it was -EEXIST then 'err' remains to be zero.

Fix the problem by reset 'err' to zero when ice_fltr_add_mac()
returns -EEXIST.

Fixes: 2ccc1c1ccc671b ("ice: Remove excess error variables")
Signed-off-by: Ivan Vecera <ivecera@...hat.com>
---
 drivers/net/ethernet/intel/ice/ice_main.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/intel/ice/ice_main.c b/drivers/net/ethernet/intel/ice/ice_main.c
index b588d7995631..d755ce07869f 100644
--- a/drivers/net/ethernet/intel/ice/ice_main.c
+++ b/drivers/net/ethernet/intel/ice/ice_main.c
@@ -5475,16 +5475,19 @@ static int ice_set_mac_address(struct net_device *netdev, void *pi)
 
 	/* Add filter for new MAC. If filter exists, return success */
 	err = ice_fltr_add_mac(vsi, mac, ICE_FWD_TO_VSI);
-	if (err == -EEXIST)
+	if (err == -EEXIST) {
 		/* Although this MAC filter is already present in hardware it's
 		 * possible in some cases (e.g. bonding) that dev_addr was
 		 * modified outside of the driver and needs to be restored back
 		 * to this value.
 		 */
 		netdev_dbg(netdev, "filter for MAC %pM already exists\n", mac);
-	else if (err)
+
+		return 0;
+	} else if (err) {
 		/* error if the new filter addition failed */
 		err = -EADDRNOTAVAIL;
+	}
 
 err_update_filters:
 	if (err) {
-- 
2.34.1