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    Subject[PATCH 3.18 11/13] usb: dwc3: gadget: Set maxpacket size for ep0 IN
    Date
    3.18-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Thinh Nguyen <Thinh.Nguyen@synopsys.com>

    commit 6180026341e852a250e1f97ebdcf71684a3c81b9 upstream.

    There are 2 control endpoint structures for DWC3. However, the driver
    only updates the OUT direction control endpoint structure during
    ConnectDone event. DWC3 driver needs to update the endpoint max packet
    size for control IN endpoint as well. If the max packet size is not
    properly set, then the driver will incorrectly calculate the data
    transfer size and fail to send ZLP for HS/FS 3-stage control read
    transfer.

    The fix is simply to update the max packet size for the ep0 IN direction
    during ConnectDone event.

    Cc: stable@vger.kernel.org
    Fixes: 72246da40f37 ("usb: Introduce DesignWare USB3 DRD Driver")
    Signed-off-by: Thinh Nguyen <thinhn@synopsys.com>
    Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/usb/dwc3/gadget.c | 2 ++
    1 file changed, 2 insertions(+)

    --- a/drivers/usb/dwc3/gadget.c
    +++ b/drivers/usb/dwc3/gadget.c
    @@ -2345,6 +2345,8 @@ static void dwc3_gadget_conndone_interru
    break;
    }

    + dwc->eps[1]->endpoint.maxpacket = dwc->gadget.ep0->maxpacket;
    +
    /* Enable USB2 LPM Capability */

    if ((dwc->revision > DWC3_REVISION_194A)

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