Commit 36448c46 authored Dec 16, 2013 by Jack Pham

usb: gadget: throttle IRQ rate for SuperSpeed



There was a merge error from commit 6e0c86d1 "USB: gadget:
u_ether: Fix data stall issue in RNDIS tethering mode"
that resulted in the accidental removal of checking if
the gadget is connected at SuperSpeed. Re-introduce this
check so that IRQs on the downlink path are throttled,
decreasing the load on the CPU.

Change-Id: Ic2aa1d433e0fded95c6e825a760e89f726360522
Signed-off-by: Jack Pham <jackp@codeaurora.org>

parent 39e0d0b3

drivers/usb/gadget/u_ether.c

+3 −2

Original line number	Diff line number	Diff line
		@@ -866,9 +866,10 @@ static netdev_tx_t eth_start_xmit(struct sk_buff *skb,

		req->length = length;

		/* throttle highspeed IRQ rate back slightly */
		/* throttle high/super speed IRQ rate back slightly */
		if (gadget_is_dualspeed(dev->gadget) &&
		(dev->gadget->speed == USB_SPEED_HIGH)) {
		(dev->gadget->speed == USB_SPEED_HIGH \|\|
		dev->gadget->speed == USB_SPEED_SUPER)) {
		dev->tx_qlen++;
		if (dev->tx_qlen == (qmult/2)) {
		req->no_interrupt = 0;