--- a/drivers/net/usb/qmi_wwan.c
+++ b/drivers/net/usb/qmi_wwan.c
@@ -1369,6 +1369,7 @@ static const struct usb_device_id produc
 	{QMI_FIXED_INTF(0x03f0, 0x9d1d, 1)},	/* HP lt4120 Snapdragon X5 LTE */
 	{QMI_FIXED_INTF(0x22de, 0x9061, 3)},	/* WeTelecom WPD-600N */
 	{QMI_QUIRK_SET_DTR(0x1e0e, 0x9001, 5)},	/* SIMCom 7100E, 7230E, 7600E ++ */
+	{QMI_FIXED_INTF(0x1c9e, 0x9b3c, 4)},	/* LONGSUNG_U9300 */
 	{QMI_QUIRK_SET_DTR(0x2c7c, 0x0121, 4)},	/* Quectel EC21 Mini PCIe */
 	{QMI_QUIRK_SET_DTR(0x2c7c, 0x0191, 4)},	/* Quectel EG91 */
 	{QMI_QUIRK_SET_DTR(0x2c7c, 0x0195, 4)},	/* Quectel EG95 */
--- a/drivers/usb/serial/option.c
+++ b/drivers/usb/serial/option.c
@@ -406,6 +406,7 @@ static void option_instat_callback(struc
  * Mobidata, etc sell under their own brand names.
  */
 #define LONGCHEER_VENDOR_ID			0x1c9e
+#define LONGSUNG_U9300_PRODUCT_ID		0x9b3c
 
 /* 4G Systems products */
 /* This one was sold as the VW and Skoda "Carstick LTE" */
@@ -623,6 +624,16 @@ static void option_instat_callback(struc
 /* Device needs ZLP */
 #define ZLP		BIT(17)
 
+struct option_blacklist_info {
+	/* bitfield of interface numbers for OPTION_BLACKLIST_SENDSETUP */
+	const unsigned long sendsetup;
+	/* bitfield of interface numbers for OPTION_BLACKLIST_RESERVED_IF */
+	const unsigned long reserved;
+};
+
+static const struct option_blacklist_info longsung_u9300_blacklist = {
+	.reserved = BIT(4),
+};
 
 static const struct usb_device_id option_ids[] = {
 	{ USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_COLT) },
@@ -657,6 +668,8 @@ static const struct usb_device_id option
 	{ USB_DEVICE(QUANTA_VENDOR_ID, QUANTA_PRODUCT_GLE) },
 	{ USB_DEVICE(QUANTA_VENDOR_ID, 0xea42),
 	  .driver_info = RSVD(4) },
+	{ USB_DEVICE(LONGCHEER_VENDOR_ID,LONGSUNG_U9300_PRODUCT_ID),
+	  .driver_info = (kernel_ulong_t)&longsung_u9300_blacklist},
 	{ USB_DEVICE_AND_INTERFACE_INFO(HUAWEI_VENDOR_ID, 0x1c05, USB_CLASS_COMM, 0x02, 0xff) },
 	{ USB_DEVICE_AND_INTERFACE_INFO(HUAWEI_VENDOR_ID, 0x1c1f, USB_CLASS_COMM, 0x02, 0xff) },
 	{ USB_DEVICE_AND_INTERFACE_INFO(HUAWEI_VENDOR_ID, 0x1c23, USB_CLASS_COMM, 0x02, 0xff) },
