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path: root/drivers/usb/serial/usb-serial.h
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Diffstat (limited to 'drivers/usb/serial/usb-serial.h')
-rw-r--r--drivers/usb/serial/usb-serial.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/usb/serial/usb-serial.h b/drivers/usb/serial/usb-serial.h
index 238a5a871ed..d7d27c3385b 100644
--- a/drivers/usb/serial/usb-serial.h
+++ b/drivers/usb/serial/usb-serial.h
@@ -16,6 +16,7 @@
#include <linux/config.h>
#include <linux/kref.h>
+#include <asm/semaphore.h>
#define SERIAL_TTY_MAJOR 188 /* Nice legal number now */
#define SERIAL_TTY_MINORS 255 /* loads of devices :) */
@@ -30,6 +31,8 @@
* @serial: pointer back to the struct usb_serial owner of this port.
* @tty: pointer to the corresponding tty for this port.
* @lock: spinlock to grab when updating portions of this structure.
+ * @sem: semaphore used to synchronize serial_open() and serial_close()
+ * access for this port.
* @number: the number of the port (the minor number).
* @interrupt_in_buffer: pointer to the interrupt in buffer for this port.
* @interrupt_in_urb: pointer to the interrupt in struct urb for this port.
@@ -60,6 +63,7 @@ struct usb_serial_port {
struct usb_serial * serial;
struct tty_struct * tty;
spinlock_t lock;
+ struct semaphore sem;
unsigned char number;
unsigned char * interrupt_in_buffer;