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| author | William Gulland <wgulland@google.com> | 2013-06-28 03:10:20 +0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-07-25 22:37:13 +0400 |
| commit | 2c7b871b9102c497ba8f972aa5d38532f05b654d (patch) | |
| tree | a6fa6f81d62622fba4401c2b1f53e665fcd3df69 | |
| parent | 172d934c92089e9183165f7024eba9508cb9ebce (diff) | |
| download | linux-2c7b871b9102c497ba8f972aa5d38532f05b654d.tar.xz | |
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>
| -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 c857471519e3..4a8a1d68002c 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); |