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usb: gadget: fix request length error for isoc transfer

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For isoc endpoint descriptor, the wMaxPacketSize is not real max packet
size (see Table 9-13. Standard Endpoint Descriptor, USB 2.0 specifcation),
it may contain the number of packet, so the real max packet should be
ep->desc->wMaxPacketSize && 0x7ff.

Cc: Felipe F. Tonello <eu@felipetonello.com>
Cc: Felipe Balbi <felipe.balbi@linux.intel.com>
Fixes: 16b114a6d7 ("usb: gadget: fix usb_ep_align_maybe
  endianness and new usb_ep_aligna")

Signed-off-by: Peter Chen <peter.chen@nxp.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
This commit is contained in:
Peter Chen 2016-11-08 10:08:24 +08:00 committed by Felipe Balbi
parent dbf499cf72
commit 982555fc26
1 changed files with 3 additions and 1 deletions
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4
include/linux/usb/gadget.h
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@ -429,7 +429,9 @@ static inline struct usb_gadget *dev_to_usb_gadget(struct device *dev)
*/
static inline size_t usb_ep_align(struct usb_ep *ep, size_t len)
{
return round_up(len, (size_t)le16_to_cpu(ep->desc->wMaxPacketSize));
int max_packet_size = (size_t)usb_endpoint_maxp(ep->desc) & 0x7ff;
return round_up(len, max_packet_size);
}
/**