usb: gadget: function: u_ether: don't starve tx request queue

commit 6c83f77278f17a7679001027e9231291c20f0d8a upstream.

If we don't guarantee that we will always get an
interrupt at least when we're queueing our very last
request, we could fall into situation where we queue
every request with 'no_interrupt' set. This will
cause the link to get stuck.

The behavior above has been triggered with g_ether
and dwc3.

Reported-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/gadget/function/u_ether.c b/drivers/usb/gadget/function/u_ether.c
index 5f562c1ec795718900e5e33de6d6e051eb2bb2ae..9b9e71f2c66e300e7e009da1ababd50f68b98536 100644 (file)
--- a/drivers/usb/gadget/function/u_ether.c
+++ b/drivers/usb/gadget/function/u_ether.c
@@ -587,8 +587,9 @@ static netdev_tx_t eth_start_xmit(struct sk_buff *skb,
 
        /* throttle high/super speed IRQ rate back slightly */
        if (gadget_is_dualspeed(dev->gadget))
-               req->no_interrupt = (dev->gadget->speed == USB_SPEED_HIGH ||
-                                    dev->gadget->speed == USB_SPEED_SUPER)
+               req->no_interrupt = (((dev->gadget->speed == USB_SPEED_HIGH ||
+                                      dev->gadget->speed == USB_SPEED_SUPER)) &&
+                                       !list_empty(&dev->tx_reqs))
                        ? ((atomic_read(&dev->tx_qlen) % dev->qmult) != 0)
                        : 0;