diff --git a/src/add-ons/kernel/drivers/ports/usb_serial/Driver.h b/src/add-ons/kernel/drivers/ports/usb_serial/Driver.h
index 96fce4cc68..a241a25781 100644
--- a/src/add-ons/kernel/drivers/ports/usb_serial/Driver.h
+++ b/src/add-ons/kernel/drivers/ports/usb_serial/Driver.h
@@ -90,15 +90,6 @@ void		uninit_driver();
 bool		usb_serial_service(struct tty *tty, uint32 op, void *buffer,
 				size_t length);
 
-status_t	usb_serial_open(const char *name, uint32 flags, void **cookie);
-status_t	usb_serial_read(void *cookie, off_t position, void *buffer, size_t *numBytes);
-status_t	usb_serial_write(void *cookie, off_t position, const void *buffer, size_t *numBytes);
-status_t	usb_serial_control(void *cookie, uint32 op, void *arg, size_t length);
-status_t	usb_serial_select(void *cookie, uint8 event, uint32 ref, selectsync *sync);
-status_t	usb_serial_deselect(void *coookie, uint8 event, selectsync *sync);
-status_t	usb_serial_close(void *cookie);
-status_t	usb_serial_free(void *cookie);
-
 const char **publish_devices();
 device_hooks *find_device(const char *name);
 }
diff --git a/src/add-ons/kernel/drivers/ports/usb_serial/SerialDevice.cpp b/src/add-ons/kernel/drivers/ports/usb_serial/SerialDevice.cpp
index 8fa547db87..5209f11dbe 100644
--- a/src/add-ons/kernel/drivers/ports/usb_serial/SerialDevice.cpp
+++ b/src/add-ons/kernel/drivers/ports/usb_serial/SerialDevice.cpp
@@ -5,6 +5,8 @@
  * Copyright (c) 2003 by Siarzhuk Zharski <imker@gmx.li>
  * Distributed under the terms of the MIT License.
  */
+#include <new>
+
 #include "SerialDevice.h"
 #include "USB3.h"
 
@@ -637,7 +639,7 @@ SerialDevice::MakeDevice(usb_device device, uint16 vendorID,
 			if (!description)
 				break;
 
-			return new ProlificDevice(device, vendorID, productID, description);
+			return new(std::nothrow) ProlificDevice(device, vendorID, productID, description);
 		}
 
 		case VENDOR_FTDI:
@@ -650,7 +652,7 @@ SerialDevice::MakeDevice(usb_device device, uint16 vendorID,
 			if (!description)
 				break;
 
-			return new FTDIDevice(device, vendorID, productID, description);
+			return new(std::nothrow) FTDIDevice(device, vendorID, productID, description);
 		}
 
 		case VENDOR_PALM:
@@ -664,9 +666,9 @@ SerialDevice::MakeDevice(usb_device device, uint16 vendorID,
 			if (!description)
 				break;
 
-			return new KLSIDevice(device, vendorID, productID, description);
+			return new(std::nothrow) KLSIDevice(device, vendorID, productID, description);
 		}
 	}
 
-	return new ACMDevice(device, vendorID, productID, "CDC ACM compatible device");
+	return new(std::nothrow) ACMDevice(device, vendorID, productID, "CDC ACM compatible device");
 }
diff --git a/src/add-ons/kernel/drivers/ports/usb_serial/Tracing.cpp b/src/add-ons/kernel/drivers/ports/usb_serial/Tracing.cpp
index 78a406e908..95d1823857 100644
--- a/src/add-ons/kernel/drivers/ports/usb_serial/Tracing.cpp
+++ b/src/add-ons/kernel/drivers/ports/usb_serial/Tracing.cpp
@@ -70,7 +70,7 @@ create_log_file()
 
 
 void
-usb_serial_trace(bool force, char *format, ...)
+usb_serial_trace(bool force, const char *format, ...)
 {
 	if (!gLogEnabled && !force)
 		return;
diff --git a/src/add-ons/kernel/drivers/ports/usb_serial/Tracing.h b/src/add-ons/kernel/drivers/ports/usb_serial/Tracing.h
index 6b90a7e8e2..6b00eec217 100644
--- a/src/add-ons/kernel/drivers/ports/usb_serial/Tracing.h
+++ b/src/add-ons/kernel/drivers/ports/usb_serial/Tracing.h
@@ -10,7 +10,7 @@
 
 void load_settings();
 void create_log_file();
-void usb_serial_trace(bool force, char *format, ...);
+void usb_serial_trace(bool force, const char *format, ...);
 
 #define TRACE_ALWAYS(x...) usb_serial_trace(true, x);
 #define TRACE(x...) usb_serial_trace(false, x);