[PATCH net] bonding: set primary_reselect in LB and AB mode

[Ding Tianhong <dingtianhong@huawei.com>]

The primary_reselect only reselection for the primary slave,
but the primary slave only support for ALB, TLB and AB mode,
so we sould set the primary_reselect for these mode.

to fix this: Add a check for ALB, TLB and AB mode in
bonding_store_primary_reselect, avoid to select active slave
again in other modes.

Signed-off-by: Ding Tianhong <dingtianhong@huawei.com>
---
 drivers/net/bonding/bond_sysfs.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/net/bonding/bond_sysfs.c b/drivers/net/bonding/bond_sysfs.c
index 47749c9..cac2291 100644
--- a/drivers/net/bonding/bond_sysfs.c
+++ b/drivers/net/bonding/bond_sysfs.c
@@ -1141,6 +1141,13 @@ static ssize_t bonding_store_primary_reselect(struct device *d,
 	if (!rtnl_trylock())
 		return restart_syscall();
 
+	if (!USES_PRIMARY(bond->params.mode)) {
+		pr_info("%s: Unable to set primary reselect; %s is in mode %d\n",
+			bond->dev->name, bond->dev->name, bond->params.mode);
+		ret = -EINVAL;
+		goto out;
+	}
+
 	new_value = bond_parse_parm(buf, pri_reselect_tbl);
 	if (new_value < 0)  {
 		pr_err("%s: Ignoring invalid primary_reselect value %.*s.\n",
-- 
1.7.12