From: Peter Chen peter.chen@nxp.com
commit 982555fc26f9d8bcdbd5f9db0378fe0682eb4188 upstream.
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: 16b114a6d797 ("usb: gadget: fix usb_ep_align_maybe endianness and new usb_ep_align")
Signed-off-by: Peter Chen peter.chen@nxp.com Signed-off-by: Felipe Balbi felipe.balbi@linux.intel.com [iwamatsu: Fix Fixes tag] Signed-off-by: Nobuhiro Iwamatsu nobuhiro1.iwamatsu@toshiba.co.jp --- include/linux/usb/gadget.h | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/include/linux/usb/gadget.h b/include/linux/usb/gadget.h index 7e84aac39ade..667e7f9fd877 100644 --- a/include/linux/usb/gadget.h +++ b/include/linux/usb/gadget.h @@ -671,7 +671,9 @@ 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); }
/**