rtlwifi: rtl_usb: Fix for URB leaking when doing ifconfig up/down

In the function rtl_usb_start we pre-allocate a certain number of urbs
for RX path but they will not be freed when calling rtl_usb_stop. This
results in leaking urbs when doing ifconfig up and down. Eventually,
the system has no available urbs.

Signed-off-by: Michael Schenk <michael.schenk@albis-elcon.com>
Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Cc: Stable <stable@vger.kernel.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

diff --git a/drivers/net/wireless/realtek/rtlwifi/usb.c b/drivers/net/wireless/realtek/rtlwifi/usb.c
index 20d3fcc19a585492e611d2177250eabb4c1ea857..44bdb2bdeeb190c1f57e1cb8535526b203491eba 100644 (file)
--- a/drivers/net/wireless/realtek/rtlwifi/usb.c
+++ b/drivers/net/wireless/realtek/rtlwifi/usb.c
@@ -818,12 +818,30 @@ static void rtl_usb_stop(struct ieee80211_hw *hw)
        struct rtl_priv *rtlpriv = rtl_priv(hw);
        struct rtl_hal *rtlhal = rtl_hal(rtl_priv(hw));
        struct rtl_usb *rtlusb = rtl_usbdev(rtl_usbpriv(hw));
+       struct urb *urb;
 
        /* should after adapter start and interrupt enable. */
        set_hal_stop(rtlhal);
        cancel_work_sync(&rtlpriv->works.fill_h2c_cmd);
        /* Enable software */
        SET_USB_STOP(rtlusb);
+
+       /* free pre-allocated URBs from rtl_usb_start() */
+       usb_kill_anchored_urbs(&rtlusb->rx_submitted);
+
+       tasklet_kill(&rtlusb->rx_work_tasklet);
+       cancel_work_sync(&rtlpriv->works.lps_change_work);
+
+       flush_workqueue(rtlpriv->works.rtl_wq);
+
+       skb_queue_purge(&rtlusb->rx_queue);
+
+       while ((urb = usb_get_from_anchor(&rtlusb->rx_cleanup_urbs))) {
+               usb_free_coherent(urb->dev, urb->transfer_buffer_length,
+                               urb->transfer_buffer, urb->transfer_dma);
+               usb_free_urb(urb);
+       }
+
        rtlpriv->cfg->ops->hw_disable(hw);
 }