diff --git a/drivers/usb/serial/aircable.c b/drivers/usb/serial/aircable.c
index 84d52953dd0a..a1df686c3066 100644
--- a/drivers/usb/serial/aircable.c
+++ b/drivers/usb/serial/aircable.c
@@ -117,7 +117,7 @@ static int aircable_process_packet(struct usb_serial_port *port,
 static void aircable_process_read_urb(struct urb *urb)
 {
 	struct usb_serial_port *port = urb->context;
-	char *data = (char *)urb->transfer_buffer;
+	char *data = urb->transfer_buffer;
 	int has_headers;
 	int count;
 	int len;
diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c
index ade68405b015..871cdccf3a5f 100644
--- a/drivers/usb/serial/ftdi_sio.c
+++ b/drivers/usb/serial/ftdi_sio.c
@@ -2584,7 +2584,7 @@ static void ftdi_process_read_urb(struct urb *urb)
 {
 	struct usb_serial_port *port = urb->context;
 	struct ftdi_private *priv = usb_get_serial_port_data(port);
-	char *data = (char *)urb->transfer_buffer;
+	char *data = urb->transfer_buffer;
 	int i;
 	int len;
 	int count = 0;
diff --git a/drivers/usb/serial/generic.c b/drivers/usb/serial/generic.c
index e60f74f11acc..d10aa3d2ee49 100644
--- a/drivers/usb/serial/generic.c
+++ b/drivers/usb/serial/generic.c
@@ -345,7 +345,7 @@ EXPORT_SYMBOL_GPL(usb_serial_generic_submit_read_urbs);
 void usb_serial_generic_process_read_urb(struct urb *urb)
 {
 	struct usb_serial_port *port = urb->context;
-	char *ch = (char *)urb->transfer_buffer;
+	char *ch = urb->transfer_buffer;
 	int i;
 
 	if (!urb->actual_length)
diff --git a/drivers/usb/serial/option.c b/drivers/usb/serial/option.c
index 254a8bbeea67..8e74903352e7 100644
--- a/drivers/usb/serial/option.c
+++ b/drivers/usb/serial/option.c
@@ -2151,8 +2151,7 @@ static void option_instat_callback(struct urb *urb)
 	dev_dbg(dev, "%s: urb %p port %p has data %p\n", __func__, urb, port, portdata);
 
 	if (status == 0) {
-		struct usb_ctrlrequest *req_pkt =
-				(struct usb_ctrlrequest *)urb->transfer_buffer;
+		struct usb_ctrlrequest *req_pkt = urb->transfer_buffer;
 
 		if (!req_pkt) {
 			dev_dbg(dev, "%s: NULL req_pkt\n", __func__);
diff --git a/drivers/usb/serial/sierra.c b/drivers/usb/serial/sierra.c
index e8b130157b57..a862aa788a19 100644
--- a/drivers/usb/serial/sierra.c
+++ b/drivers/usb/serial/sierra.c
@@ -570,8 +570,7 @@ static void sierra_instat_callback(struct urb *urb)
 		urb, port, portdata);
 
 	if (status == 0) {
-		struct usb_ctrlrequest *req_pkt =
-				(struct usb_ctrlrequest *)urb->transfer_buffer;
+		struct usb_ctrlrequest *req_pkt = urb->transfer_buffer;
 
 		if (!req_pkt) {
 			dev_dbg(&port->dev, "%s: NULL req_pkt\n",
diff --git a/drivers/usb/serial/ssu100.c b/drivers/usb/serial/ssu100.c
index 01472b96bf38..7d39d35e52a1 100644
--- a/drivers/usb/serial/ssu100.c
+++ b/drivers/usb/serial/ssu100.c
@@ -495,7 +495,7 @@ static void ssu100_update_lsr(struct usb_serial_port *port, u8 lsr,
 static void ssu100_process_read_urb(struct urb *urb)
 {
 	struct usb_serial_port *port = urb->context;
-	char *packet = (char *)urb->transfer_buffer;
+	char *packet = urb->transfer_buffer;
 	char flag = TTY_NORMAL;
 	u32 len = urb->actual_length;
 	int i;