USB: Edgeport USB Serial Converter: convert es_sem to mutex

Edgeport USB Serial Converter: convert semaphore es_sem to the
mutex API

Signed-off-by: Matthias Kaehlcke <matthias.kaehlcke@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 11 insertions, 10 deletions

diff --git a/drivers/usb/serial/io_ti.c b/drivers/usb/serial/io_ti.c
index b8670905bc3a..f7fdf1ce6bf3 100644
--- a/drivers/usb/serial/io_ti.c
+++ b/drivers/usb/serial/io_ti.c
@@ -34,6 +34,7 @@
 #include <linux/tty_flip.h>
 #include <linux/module.h>
 #include <linux/spinlock.h>
+#include <linux/mutex.h>
 #include <linux/serial.h>
 #include <linux/ioctl.h>
 #include <asm/uaccess.h>
@@ -133,7 +134,7 @@ struct edgeport_serial {
         struct product_info product_info;
         u8 TI_I2C_Type;                 // Type of I2C in UMP
         u8 TiReadI2C;                   // Set to TRUE if we have read the I2c in Boot Mode
-        struct semaphore es_sem;
+        struct mutex es_lock;
         int num_ports_open;
         struct usb_serial *serial;
 };
@@ -2044,7 +2045,7 @@ static int edge_open (struct usb_serial_port *port, struct file * filp)
         dbg ("ShadowMCR 0x%X", edge_port->shadow_mcr);
 
         edge_serial = edge_port->edge_serial;
-        if (down_interruptible(&edge_serial->es_sem))
+        if (mutex_lock_interruptible(&edge_serial->es_lock))
                 return -ERESTARTSYS;
         if (edge_serial->num_ports_open == 0) {
                 /* we are the first port to be opened, let's post the interrupt urb */
@@ -2052,7 +2053,7 @@ static int edge_open (struct usb_serial_port *port, struct file * filp)
                 if (!urb) {
                         dev_err (&port->dev, "%s - no interrupt urb present, exiting\n", __FUNCTION__);
                         status = -EINVAL;
-                        goto up_es_sem;
+                        goto release_es_lock;
                 }
                 urb->complete = edge_interrupt_callback;
                 urb->context = edge_serial;
@@ -2060,7 +2061,7 @@ static int edge_open (struct usb_serial_port *port, struct file * filp)
                 status = usb_submit_urb (urb, GFP_KERNEL);
                 if (status) {
                         dev_err (&port->dev, "%s - usb_submit_urb failed with value %d\n", __FUNCTION__, status);
-                        goto up_es_sem;
+                        goto release_es_lock;
                 }
         }
 
@@ -2092,13 +2093,13 @@ static int edge_open (struct usb_serial_port *port, struct file * filp)
 
         dbg("%s - exited", __FUNCTION__);
 
-        goto up_es_sem;
+        goto release_es_lock;
 
 unlink_int_urb:
         if (edge_port->edge_serial->num_ports_open == 0)
                 usb_kill_urb(port->serial->port[0]->interrupt_in_urb);
-up_es_sem:
-        up(&edge_serial->es_sem);
+release_es_lock:
+        mutex_unlock(&edge_serial->es_lock);
         return status;
 }
 
@@ -2137,14 +2138,14 @@ static void edge_close (struct usb_serial_port *port, struct file *filp)
                                      0,
                                      NULL,
                                      0);
-        down(&edge_serial->es_sem);
+        mutex_lock(&edge_serial->es_lock);
         --edge_port->edge_serial->num_ports_open;
         if (edge_port->edge_serial->num_ports_open <= 0) {
                 /* last port is now closed, let's shut down our interrupt urb */
                 usb_kill_urb(port->serial->port[0]->interrupt_in_urb);
                 edge_port->edge_serial->num_ports_open = 0;
         }
-        up(&edge_serial->es_sem);
+        mutex_unlock(&edge_serial->es_lock);
         edge_port->close_pending = 0;
 
         dbg("%s - exited", __FUNCTION__);
@@ -2743,7 +2744,7 @@ static int edge_startup (struct usb_serial *serial)
                 dev_err(&serial->dev->dev, "%s - Out of memory\n", __FUNCTION__);
                 return -ENOMEM;
         }
-        sema_init(&edge_serial->es_sem, 1);
+        mutex_init(&edge_serial->es_lock);
         edge_serial->serial = serial;
         usb_set_serial_data(serial, edge_serial);