usb: gadget: u_ether: conditionally align transfer size

Unless HW sets quirk_ep_out_aligned_size, gadget driver shouldn't make
any efforts towards aligning transfers. If the UDC needs, it *must*
set the quirk flag.

Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

diff --git a/drivers/usb/gadget/function/u_ether.c b/drivers/usb/gadget/function/u_ether.c
index cba6ff6..a8b40d0 100644 (file)
--- a/drivers/usb/gadget/function/u_ether.c
+++ b/drivers/usb/gadget/function/u_ether.c
@@ -178,6 +178,7 @@ static void rx_complete(struct usb_ep *ep, struct usb_request *req);
 static int
 rx_submit(struct eth_dev *dev, struct usb_request *req, gfp_t gfp_flags)
 {
+       struct usb_gadget *g = dev->gadget;
        struct sk_buff  *skb;
        int             retval = -ENOMEM;
        size_t          size = 0;
@@ -209,8 +210,11 @@ rx_submit(struct eth_dev *dev, struct usb_request *req, gfp_t gfp_flags)
         */
        size += sizeof(struct ethhdr) + dev->net->mtu + RX_EXTRA;
        size += dev->port_usb->header_len;
-       size += out->maxpacket - 1;
-       size -= size % out->maxpacket;
+
+       if (g->quirk_ep_out_aligned_size) {
+               size += out->maxpacket - 1;
+               size -= size % out->maxpacket;
+       }
 
        if (dev->port_usb->is_fixed)
                size = max_t(size_t, size, dev->port_usb->fixed_out_len);