[PATCH] wifi: cw1200: unwind failed interface additions

[Jiale Yao]

cw1200 publishes the vif and changes its mode before cw1200_setup_mac(),
but leaves that state in place if setup fails. mac80211 will not call
remove_interface for the failed addition, so subsequent interface
requests are rejected as busy.

Restore the empty monitor state when MAC setup fails.

Fixes: a910e4a94f69 ("cw1200: add driver for the ST-E CW1100 & CW1200 WLAN chipsets")
Signed-off-by: Jiale Yao <yaojiale02@xxxxxxx>
---
 drivers/net/wireless/st/cw1200/sta.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/wireless/st/cw1200/sta.c b/drivers/net/wireless/st/cw1200/sta.c
index 5d8eaa700779..92a729f1e9ef 100644
--- a/drivers/net/wireless/st/cw1200/sta.c
+++ b/drivers/net/wireless/st/cw1200/sta.c
@@ -235,6 +235,11 @@ int cw1200_add_interface(struct ieee80211_hw *dev,
 	priv->vif = vif;
 	memcpy(priv->mac_addr, vif->addr, ETH_ALEN);
 	ret = cw1200_setup_mac(priv);
+	if (ret) {
+		priv->vif = NULL;
+		priv->mode = NL80211_IFTYPE_MONITOR;
+		eth_zero_addr(priv->mac_addr);
+	}
 	/* Enable auto-calibration */
 	/* Exception in subsequent channel switch; disabled.
 	 *  wsm_write_mib(priv, WSM_MIB_ID_SET_AUTO_CALIBRATION_MODE,
-- 
2.34.1