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Commit 9a971dda authored by Ming Lei's avatar Ming Lei Committed by Greg Kroah-Hartman
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usb: ehci: only prepare zero packet for out transfer if required 



Obviously, ZLP is only required for transfer of OUT direction,
so just take same policy with UHCI for ZLP packet.

Signed-off-by: default avatarMing Lei <tom.leiming@gmail.com>
Signed-off-by: default avatarAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 0412560e

drivers/usb/host/ehci-q.c

+3 −2
Original line number Diff line number Diff line
@@ -722,7 +722,8 @@ qh_urb_transaction ( 


	/*

	 * control requests may need a terminating data "status" ack;

	 * bulk ones may need a terminating short packet (zero length).

	 * other OUT ones may need a terminating short packet

	 * (zero length).

	 */

	if (likely (urb->transfer_buffer_length != 0)) {

		int	one_more = 0;
@@ -731,7 +732,7 @@ qh_urb_transaction ( 
			one_more = 1;

			token ^= 0x0100;	/* "in" <--> "out"  */

			token |= QTD_TOGGLE;	/* force DATA1 */

		} else if (usb_pipebulk (urb->pipe)

		} else if (usb_pipeout(urb->pipe)

				&& (urb->transfer_flags & URB_ZERO_PACKET)

				&& !(urb->transfer_buffer_length % maxpacket)) {

			one_more = 1;