[PATCH] libertas: Add spinlock to avoid race condition

[Pavel Andrianov]

lbs_mac_event_disconnected may free priv->currenttxskb
while lbs_hard_start_xmit accesses to it.
The patch adds a spinlock for mutual exclusion.

Tested on OLPC XO-1 (usb8388) and XO-1.5 (sd8686) with v4.7-rc3.

Confirmed that lbs_mac_event_disconnected is being called on the
station when hostapd on access point is given SIGHUP.

Signed-off-by: Pavel <andria...@ispras.ru>
Tested-by: James Cameron <qu...@laptop.org>
---
 drivers/net/wireless/marvell/libertas/cmdresp.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/wireless/marvell/libertas/cmdresp.c 
b/drivers/net/wireless/marvell/libertas/cmdresp.c
index c95bf6d..c67ae07 100644
--- a/drivers/net/wireless/marvell/libertas/cmdresp.c
+++ b/drivers/net/wireless/marvell/libertas/cmdresp.c
@@ -27,6 +27,8 @@
 void lbs_mac_event_disconnected(struct lbs_private *priv,
                                bool locally_generated)
 {
+       unsigned long flags;
+
        if (priv->connect_status != LBS_CONNECTED)
                return;
 
@@ -46,9 +48,11 @@ void lbs_mac_event_disconnected(struct lbs_private *priv,
        netif_carrier_off(priv->dev);
 
        /* Free Tx and Rx packets */
+       spin_lock_irqsave(&priv->driver_lock, flags);
        kfree_skb(priv->currenttxskb);
        priv->currenttxskb = NULL;
        priv->tx_pending_len = 0;
+       spin_unlock_irqrestore(&priv->driver_lock, flags);
 
        priv->connect_status = LBS_DISCONNECTED;
 
-- 
1.7.11.7