linux-kernel - [PATCH 6.6 122/638] wifi: wilc1000: fix multi-vif management when deleting a vif

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Message-ID: <20240324230116.1348576-123-sashal@kernel.org>
Date: Sun, 24 Mar 2024 18:52:39 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Ajay Singh <ajay.kathat@...rochip.com>,
	Alexis Lothoré <alexis.lothore@...tlin.com>,
	Kalle Valo <kvalo@...nel.org>,
	Sasha Levin <sashal@...nel.org>
Subject: [PATCH 6.6 122/638] wifi: wilc1000: fix multi-vif management when deleting a vif

From: Ajay Singh <ajay.kathat@...rochip.com>

[ Upstream commit 12cfc9c8d3faf887a202c89bc312202445fca7e8 ]

Adding then removing a second vif currently makes the first vif not working
anymore. This is visible for example when we have a first interface
connected to some access point:
- create a wpa_supplicant.conf with some AP credentials
- wpa_supplicant -Dnl80211 -c /etc/wpa_supplicant.conf -i wlan0
- dhclient wlan0
- iw phy phy0 interface add wlan1 type managed
- iw dev wlan1 del
wlan0 does not manage properly traffic anymore (eg: ping not working)

This is due to vif mode being incorrectly reconfigured with some default
values in del_virtual_intf, affecting by default first vif.

Prevent first vif from being affected on second vif removal by removing vif
mode change command in del_virtual_intf

Fixes: 9bc061e88054 ("staging: wilc1000: added support to dynamically add/remove interfaces")
Signed-off-by: Ajay Singh <ajay.kathat@...rochip.com>
Co-developed-by: Alexis Lothoré <alexis.lothore@...tlin.com>
Signed-off-by: Alexis Lothoré <alexis.lothore@...tlin.com>
Signed-off-by: Kalle Valo <kvalo@...nel.org>
Link: https://msgid.link/20240115-wilc_1000_fixes-v1-5-54d29463a738@bootlin.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/wireless/microchip/wilc1000/cfg80211.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/net/wireless/microchip/wilc1000/cfg80211.c b/drivers/net/wireless/microchip/wilc1000/cfg80211.c
index 2f75dc4b47975..6f3245a43aef1 100644
--- a/drivers/net/wireless/microchip/wilc1000/cfg80211.c
+++ b/drivers/net/wireless/microchip/wilc1000/cfg80211.c
@@ -1615,7 +1615,6 @@ static int del_virtual_intf(struct wiphy *wiphy, struct wireless_dev *wdev)
 	cfg80211_unregister_netdevice(vif->ndev);
 	vif->monitor_flag = 0;
 
-	wilc_set_operation_mode(vif, 0, 0, 0);
 	mutex_lock(&wl->vif_mutex);
 	list_del_rcu(&vif->list);
 	wl->vif_num--;
-- 
2.43.0