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Commit 9672f0fe authored by Amit Virdi's avatar Amit Virdi Committed by Greg Kroah-Hartman
Browse files

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: default avatarAmit Virdi <amit.virdi@st.com>
Acked-by: default avatarHans de Goede <hdegoede@redhat.com>
Acked-by: default avatarAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: default avatarGreg 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 */