Commit 982555fc authored by Peter Chen's avatar Peter Chen Committed by Felipe Balbi

usb: gadget: fix request length error for isoc transfer

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: 16b114a6 ("usb: gadget: fix usb_ep_align_maybe
  endianness and new usb_ep_aligna")
Signed-off-by: 's avatarPeter Chen <peter.chen@nxp.com>
Signed-off-by: 's avatarFelipe Balbi <felipe.balbi@linux.intel.com>
parent dbf499cf
...@@ -429,7 +429,9 @@ static inline struct usb_gadget *dev_to_usb_gadget(struct device *dev) ...@@ -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) 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);
} }
/** /**
......
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment