From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, "Felipe F. Tonello" , Felipe Balbi , Peter Chen Subject: [PATCH 4.9 076/206] usb: gadget: fix request length error for isoc transfer Date: Tue, 10 Jan 2017 14:35:59 +0100 Message-Id: <20170110131506.063442034@linuxfoundation.org> In-Reply-To: <20170110131502.767555407@linuxfoundation.org> References: <20170110131502.767555407@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: 4.9-stable review patch. If anyone has any objections, please let me know. ------------------ From: Peter Chen 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 Cc: Felipe Balbi Fixes: 16b114a6d797 ("usb: gadget: fix usb_ep_align_maybe endianness and new usb_ep_aligna") Signed-off-by: Peter Chen Signed-off-by: Felipe Balbi Signed-off-by: Greg Kroah-Hartman --- 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 @@ -429,7 +429,9 @@ 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); } /**