On Wednesday 15 June 2016 05:04 PM, Pavel Andrianov wrote:
> 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 <andrianov@xxxxxxxxx>
> Tested-by: James Cameron <quozl@xxxxxxxxxx>
Looks good to me.
Acked-by: Vaishali Thakkar <vaishali.thakkar@xxxxxxxxxx>
> ---
> 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;
>
>
--
Vaishali
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