linux-kernel - [PATCH] usb: Clear both buffers when clearing a control transfer TT buffer.

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Date:	Thu, 27 Jun 2013 16:10:20 -0700
From:	William Gulland <wgulland@...gle.com>
To:	Alan Stern <stern@...land.harvard.edu>,
	Sarah Sharp <sarah.a.sharp@...ux.intel.com>,
	Lan Tianyu <tianyu.lan@...el.com>,
	Ming Lei <ming.lei@...onical.com>, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc:	William Gulland <wgulland@...gle.com>
Subject: [PATCH] usb: Clear both buffers when clearing a control transfer TT buffer.

    Control transfers have both IN and OUT (or SETUP) packets, so when
    clearing TT buffers for a control transfer it's necessary to send
    two HUB_CLEAR_TT_BUFFER requests to the hub.

Signed-off-by: William Gulland <wgulland@...gle.com>
---
 drivers/usb/core/hub.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index feef935..868ad74 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -668,6 +668,15 @@ resubmit:
 static inline int
 hub_clear_tt_buffer (struct usb_device *hdev, u16 devinfo, u16 tt)
 {
+	/* Need to clear both directions for control ep */
+	if (((devinfo >> 11) & USB_ENDPOINT_XFERTYPE_MASK) ==
+			USB_ENDPOINT_XFER_CONTROL) {
+		int status = usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
+				HUB_CLEAR_TT_BUFFER, USB_RT_PORT,
+				devinfo ^ 0x8000, tt, NULL, 0, 1000);
+		if (status)
+			return status;
+	}
 	return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
 			       HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo,
 			       tt, NULL, 0, 1000);
-- 
1.8.3

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