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@google.com> Acked-by: Alan Stern <stern@rowland.harvard.edu> Cc: stable <stable@vger.kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -668,6 +668,15 @@ resubmit:
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static inline int
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hub_clear_tt_buffer (struct usb_device *hdev, u16 devinfo, u16 tt)
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{
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/* Need to clear both directions for control ep */
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if (((devinfo >> 11) & USB_ENDPOINT_XFERTYPE_MASK) ==
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USB_ENDPOINT_XFER_CONTROL) {
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int status = usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
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HUB_CLEAR_TT_BUFFER, USB_RT_PORT,
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devinfo ^ 0x8000, tt, NULL, 0, 1000);
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if (status)
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return status;
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}
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return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
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HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo,
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tt, NULL, 0, 1000);
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