diff options
| author | William Gulland <wgulland@google.com> | 2013-06-27 16:10:20 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-08-04 16:25:53 +0800 |
| commit | 9e914980a5d558f38ba9a0176a4bdea8def9b99b (patch) | |
| tree | 0b9a387a42b83efd24cffa8fa12b1473e6a24afa /drivers/usb/core | |
| parent | 06b19056b9fe16a5b235510acd125974db9d7678 (diff) | |
usb: Clear both buffers when clearing a control transfer TT buffer.
commit 2c7b871b9102c497ba8f972aa5d38532f05b654d upstream.
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/core')
| -rw-r--r-- | drivers/usb/core/hub.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c index 49b139c1505..a969ec10500 100644 --- a/drivers/usb/core/hub.c +++ b/drivers/usb/core/hub.c @@ -488,6 +488,15 @@ 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); |