iavf: Fix for setting queues to 0

BugLink: https://bugs.launchpad.net/bugs/1952579
[ Upstream commit 9a6e9e483a9684a34573fd9f9e30ecfb047cb8cb ]

Now setting combine to 0 will be rejected with the
appropriate error code.
This has been implemented by adding a condition that checks
the value of combine equal to zero.
Without this patch, when the user requested it, no error was
returned and combine was set to the default value for VF.

Fixes: 5520deb15326 ("iavf: Enable support for up to 16 queues")
Signed-off-by: Grzegorz Szczurek <grzegorzx.szczurek@intel.com>
Tested-by: Tony Brelinski <tony.brelinski@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Andrea Righi <andrea.righi@canonical.com>

diff --git a/drivers/net/ethernet/intel/iavf/iavf_ethtool.c b/drivers/net/ethernet/intel/iavf/iavf_ethtool.c
index 25ee0606e625faf821806134f846fb7e120da628..144a776793597fa6f9b0fdc5f250e5ddb6e0c167 100644 (file)
--- a/drivers/net/ethernet/intel/iavf/iavf_ethtool.c
+++ b/drivers/net/ethernet/intel/iavf/iavf_ethtool.c
@@ -1787,7 +1787,7 @@ static int iavf_set_channels(struct net_device *netdev,
        /* All of these should have already been checked by ethtool before this
         * even gets to us, but just to be sure.
         */
-       if (num_req > adapter->vsi_res->num_queue_pairs)
+       if (num_req == 0 || num_req > adapter->vsi_res->num_queue_pairs)
                return -EINVAL;
 
        if (num_req == adapter->num_active_queues)