This is a note to let you know that I've just added the patch titled
usb: gadget: fix request length error for isoc transfer
to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
usb-gadget-fix-request-length-error-for-isoc-transfer.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 982555fc26f9d8bcdbd5f9db0378fe0682eb4188 Mon Sep 17 00:00:00 2001
From: Peter Chen <peter.chen@xxxxxxx>
Date: Tue, 8 Nov 2016 10:08:24 +0800
Subject: usb: gadget: fix request length error for isoc transfer
From: Peter Chen <peter.chen@xxxxxxx>
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@xxxxxxxxxxxxxxxxx>
Cc: Felipe Balbi <felipe.balbi@xxxxxxxxxxxxxxx>
Fixes: 16b114a6d797 ("usb: gadget: fix usb_ep_align_maybe
endianness and new usb_ep_aligna")
Signed-off-by: Peter Chen <peter.chen@xxxxxxx>
Signed-off-by: Felipe Balbi <felipe.balbi@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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);
}
/**
Patches currently in stable-queue which might be from peter.chen@xxxxxxx are
queue-4.9/usb-gadget-fix-request-length-error-for-isoc-transfer.patch
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