diff options
author | Peter Chen <peter.chen@nxp.com> | 2016-11-08 10:08:24 +0800 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-06-11 12:24:12 +0200 |
commit | 2b13a9580ef982393396968a27a2dad50dc42df2 (patch) | |
tree | 44e51e6c8f11b19b06d63d516c5b919c7d7fb1da /include | |
parent | 8b15aae1baa20e17fc153c21c269fed8c16f2853 (diff) |
usb: gadget: fix request length error for isoc transfer
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>
Diffstat (limited to 'include')
-rw-r--r-- | include/linux/usb/gadget.h | 4 |
1 files changed, 3 insertions, 1 deletions
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); } /** |