USB: serial: option: add ZLP support for 0x1bc7/0x9010

commit 2438c3a19dec5e98905fd3ffcc2f24716aceda6b upstream.

Telit FN980 flashing device 0x1bc7/0x9010 requires zero packet
to be sent if out data size is is equal to the endpoint max size.

Signed-off-by: Daniele Palmas <dnlplm@gmail.com>
[ johan: switch operands in conditional ]
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/serial/option.c b/drivers/usb/serial/option.c
index 2d302ff..5ea4cd1 100644 (file)
--- a/drivers/usb/serial/option.c
+++ b/drivers/usb/serial/option.c
@@ -566,6 +566,9 @@ static void option_instat_callback(struct urb *urb);
 /* Interface is reserved */
 #define RSVD(ifnum)    ((BIT(ifnum) & 0xff) << 0)
 
+/* Device needs ZLP */
+#define ZLP            BIT(17)
+
 
 static const struct usb_device_id option_ids[] = {
        { USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_COLT) },
@@ -1193,6 +1196,8 @@ static const struct usb_device_id option_ids[] = {
          .driver_info = NCTRL(0) | RSVD(1) },
        { USB_DEVICE_INTERFACE_CLASS(TELIT_VENDOR_ID, 0x1901, 0xff),    /* Telit LN940 (MBIM) */
          .driver_info = NCTRL(0) },
+       { USB_DEVICE(TELIT_VENDOR_ID, 0x9010),                          /* Telit SBL FN980 flashing device */
+         .driver_info = NCTRL(0) | ZLP },
        { USB_DEVICE_AND_INTERFACE_INFO(ZTE_VENDOR_ID, ZTE_PRODUCT_MF622, 0xff, 0xff, 0xff) }, /* ZTE WCDMA products */
        { USB_DEVICE_AND_INTERFACE_INFO(ZTE_VENDOR_ID, 0x0002, 0xff, 0xff, 0xff),
          .driver_info = RSVD(1) },
@@ -2097,6 +2102,9 @@ static int option_attach(struct usb_serial *serial)
        if (!(device_flags & NCTRL(iface_desc->bInterfaceNumber)))
                data->use_send_setup = 1;
 
+       if (device_flags & ZLP)
+               data->use_zlp = 1;
+
        spin_lock_init(&data->susp_lock);
 
        usb_set_serial_data(serial, data);

diff --git a/drivers/usb/serial/usb-wwan.h b/drivers/usb/serial/usb-wwan.h
index 44b25c0..1d0e285 100644 (file)
--- a/drivers/usb/serial/usb-wwan.h
+++ b/drivers/usb/serial/usb-wwan.h
@@ -35,6 +35,7 @@ struct usb_wwan_intf_private {
        spinlock_t susp_lock;
        unsigned int suspended:1;
        unsigned int use_send_setup:1;
+       unsigned int use_zlp:1;
        int in_flight;
        unsigned int open_ports;
        void *private;

diff --git a/drivers/usb/serial/usb_wwan.c b/drivers/usb/serial/usb_wwan.c
index be9cb61..485bad7 100644 (file)
--- a/drivers/usb/serial/usb_wwan.c
+++ b/drivers/usb/serial/usb_wwan.c
@@ -495,6 +495,7 @@ static struct urb *usb_wwan_setup_urb(struct usb_serial_port *port,
                                      void (*callback) (struct urb *))
 {
        struct usb_serial *serial = port->serial;
+       struct usb_wwan_intf_private *intfdata = usb_get_serial_data(serial);
        struct urb *urb;
 
        urb = usb_alloc_urb(0, GFP_KERNEL);     /* No ISO */
@@ -505,6 +506,9 @@ static struct urb *usb_wwan_setup_urb(struct usb_serial_port *port,
                          usb_sndbulkpipe(serial->dev, endpoint) | dir,
                          buf, len, callback, ctx);
 
+       if (intfdata->use_zlp && dir == USB_DIR_OUT)
+               urb->transfer_flags |= URB_ZERO_PACKET;
+
        return urb;
 }