USB: TI 3410/5052 USB Serial: convert td_open_close_lock to mutex

TI 3410/5052 USB Serial: convert semaphore td_open_close_lock to the mutex
API.

Signed-off-by: Matthias Kaehlcke <matthias.kaehlcke@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 14 insertions, 13 deletions

diff --git a/drivers/usb/serial/ti_usb_3410_5052.c b/drivers/usb/serial/ti_usb_3410_5052.c
index 1f0149495fb4..995fdf3c4898 100644
--- a/drivers/usb/serial/ti_usb_3410_5052.c
+++ b/drivers/usb/serial/ti_usb_3410_5052.c
@@ -80,6 +80,7 @@
 #include <linux/ioctl.h>
 #include <linux/serial.h>
 #include <linux/circ_buf.h>
+#include <linux/mutex.h>
 #include <asm/uaccess.h>
 #include <asm/semaphore.h>
 #include <linux/usb.h>
@@ -139,7 +140,7 @@ struct ti_port {
 };
 
 struct ti_device {
-        struct semaphore        td_open_close_sem;
+        struct mutex            td_open_close_lock;
         int                     td_open_port_count;
         struct usb_serial       *td_serial;
         int                     td_is_3410;
@@ -424,7 +425,7 @@ static int ti_startup(struct usb_serial *serial)
                 dev_err(&dev->dev, "%s - out of memory\n", __FUNCTION__);
                 return -ENOMEM;
         }
-        sema_init(&tdev->td_open_close_sem, 1);
+        mutex_init(&tdev->td_open_close_lock);
         tdev->td_serial = serial;
         usb_set_serial_data(serial, tdev);
 
@@ -547,7 +548,7 @@ static int ti_open(struct usb_serial_port *port, struct file *file)
         tdev = tport->tp_tdev;
 
         /* only one open on any port on a device at a time */
-        if (down_interruptible(&tdev->td_open_close_sem))
+        if (mutex_lock_interruptible(&tdev->td_open_close_lock))
                 return -ERESTARTSYS;
 
         if (port->tty)
@@ -568,7 +569,7 @@ static int ti_open(struct usb_serial_port *port, struct file *file)
                 if (!urb) {
                         dev_err(&port->dev, "%s - no interrupt urb\n", __FUNCTION__);
                         status = -EINVAL;
-                        goto up_sem;
+                        goto release_lock;
                 }
                 urb->complete = ti_interrupt_callback;
                 urb->context = tdev;
@@ -576,7 +577,7 @@ static int ti_open(struct usb_serial_port *port, struct file *file)
                 status = usb_submit_urb(urb, GFP_KERNEL);
                 if (status) {
                         dev_err(&port->dev, "%s - submit interrupt urb failed, %d\n", __FUNCTION__, status);
-                        goto up_sem;
+                        goto release_lock;
                 }
         }
 
@@ -656,13 +657,13 @@ static int ti_open(struct usb_serial_port *port, struct file *file)
         tport->tp_is_open = 1;
         ++tdev->td_open_port_count;
 
-        goto up_sem;
+        goto release_lock;
 
 unlink_int_urb:
         if (tdev->td_open_port_count == 0)
                 usb_kill_urb(port->serial->port[0]->interrupt_in_urb);
-up_sem:
-        up(&tdev->td_open_close_sem);
+release_lock:
+        mutex_unlock(&tdev->td_open_close_lock);
         dbg("%s - exit %d", __FUNCTION__, status);
         return status;
 }
@@ -674,7 +675,7 @@ static void ti_close(struct usb_serial_port *port, struct file *file)
         struct ti_port *tport;
         int port_number;
         int status;
-        int do_up;
+        int do_unlock;
 
         dbg("%s - port %d", __FUNCTION__, port->number);
                          
@@ -699,16 +700,16 @@ static void ti_close(struct usb_serial_port *port, struct file *file)
         if (status)
                 dev_err(&port->dev, "%s - cannot send close port command, %d\n" , __FUNCTION__, status);
 
-        /* if down is interrupted, continue anyway */
-        do_up = !down_interruptible(&tdev->td_open_close_sem);
+        /* if mutex_lock is interrupted, continue anyway */
+        do_unlock = !mutex_lock_interruptible(&tdev->td_open_close_lock);
         --tport->tp_tdev->td_open_port_count;
         if (tport->tp_tdev->td_open_port_count <= 0) {
                 /* last port is closed, shut down interrupt urb */
                 usb_kill_urb(port->serial->port[0]->interrupt_in_urb);
                 tport->tp_tdev->td_open_port_count = 0;
         }
-        if (do_up)
-                up(&tdev->td_open_close_sem);
+        if (do_unlock)
+                mutex_unlock(&tdev->td_open_close_lock);
 
         dbg("%s - exit", __FUNCTION__);
 }