From: Pavel Andrianov Date: Wed, 15 Jun 2016 11:34:03 +0000 (+0400) Subject: libertas: Add spinlock to avoid race condition X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=f52b041aed77592862c97726b98d78e8dccd72c9;p=openwrt%2Fstaging%2Fblogic.git libertas: Add spinlock to avoid race condition 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 Tested-by: James Cameron Acked-by: Vaishali Thakkar Signed-off-by: Kalle Valo --- diff --git a/drivers/net/wireless/marvell/libertas/cmdresp.c b/drivers/net/wireless/marvell/libertas/cmdresp.c index c95bf6dc9522..c753e36c2c0e 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;