Commit 9672f0fe authored Jul 21, 2014 by Amit Virdi Committed by Greg Kroah-Hartman Jul 22, 2014

usb: core: allow zero packet flag for interrupt urbs



Section 4.4.7.2 "Interrupt Transfer Bandwidth Requirements" of the USB3.0 spec
says:
	A zero-length data payload is a valid transfer and may be useful for
	some implementations.

So, extend the logic of allowing URB_ZERO_PACKET to interrupt urbs too.
Otherwise, the kernel throws warning of BOGUS transfer flags.

Signed-off-by: Amit Virdi <amit.virdi@st.com>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent b1bd3f1a

drivers/usb/core/urb.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -454,6 +454,7 @@ int usb_submit_urb(struct urb *urb, gfp_t mem_flags)
		URB_FREE_BUFFER);
		switch (xfertype) {
		case USB_ENDPOINT_XFER_BULK:
		case USB_ENDPOINT_XFER_INT:
		if (is_out)
		allowed \|= URB_ZERO_PACKET;
		/* FALLTHROUGH */

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