| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.4 227/241] usb: gadget: fix request length error for isoc transfer | Date | Sun, 9 Jun 2019 18:42:49 +0200 |
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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_aligna")
Signed-off-by: Peter Chen <peter.chen@nxp.com> Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com> Signed-off-by: Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@toshiba.co.jp> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- include/linux/usb/gadget.h | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
--- a/include/linux/usb/gadget.h +++ b/include/linux/usb/gadget.h @@ -671,7 +671,9 @@ static inline struct usb_gadget *dev_to_ */ 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); } /**
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