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usb: gadget: u_ether: remove interrupt throttling

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According to Dave Miller "the networking stack has a
hard requirement that all SKBs which are transmitted
must have their completion signalled in a fininte
amount of time. This is because, until the SKB is
freed by the driver, it holds onto socket,
netfilter, and other subsystem resources."

In summary, this means that using TX IRQ throttling
for the networking gadgets is, at least, complex and
we should avoid it for the time being.

Cc: <stable@vger.kernel.org>
Reported-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Tested-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Suggested-by: David Miller <davem@davemloft.net>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
This commit is contained in:
Felipe Balbi 2016-11-01 13:20:22 +02:00
parent 4accb8a1ee
commit fd9afd3cbe
1 changed files with 0 additions and 8 deletions
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8
drivers/usb/gadget/function/u_ether.c
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@ -588,14 +588,6 @@ static netdev_tx_t eth_start_xmit(struct sk_buff *skb,
req->length = length;
/* 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)) &&
!list_empty(&dev->tx_reqs))
? ((atomic_read(&dev->tx_qlen) % dev->qmult) != 0)
: 0;
retval = usb_ep_queue(in, req, GFP_ATOMIC);
switch (retval) {
default: