use mutex instead of semaphore in several drivers

index 4831edb..018884d 100644
@@ -23,6 +23,7 @@
 #include <linux/device.h>
 #include <linux/init.h>
 #include <linux/cache.h>
+#include <linux/mutex.h>
 #include <linux/spi/spi.h>
 
 

@@ -185,7 +186,7 @@ struct boardinfo {
 };
 
 static LIST_HEAD(board_list);
-static DECLARE_MUTEX(board_lock);
+static DEFINE_MUTEX(board_lock);
 
 
 /**

@@ -292,9 +293,9 @@ spi_register_board_info(struct spi_board_info const *info, unsigned n)
 	bi->n_board_info = n;
 	memcpy(bi->board_info, info, n * sizeof *info);
 
-	down(&board_lock);
+	mutex_lock(&board_lock);
 	list_add_tail(&bi->list, &board_list);
-	up(&board_lock);
+	mutex_unlock(&board_lock);
 	return 0;
 }
 

@@ -308,7 +309,7 @@ scan_boardinfo(struct spi_master *master)
 	struct boardinfo	*bi;
 	struct device		*dev = master->cdev.dev;
 
-	down(&board_lock);
+	mutex_lock(&board_lock);
 	list_for_each_entry(bi, &board_list, list) {
 		struct spi_board_info	*chip = bi->board_info;
 		unsigned		n;

@@ -330,7 +331,7 @@ scan_boardinfo(struct spi_master *master)
 			(void) spi_new_device(master, chip);
 		}
 	}
-	up(&board_lock);
+	mutex_unlock(&board_lock);
 }
 
 /*-------------------------------------------------------------------------*/

index dd33ff0..4192d24 100644
@@ -33,6 +33,7 @@
 #include <linux/device.h>
 #include <linux/tty.h>
 #include <linux/tty_flip.h>
+#include <linux/mutex.h>
 
 #include <asm/byteorder.h>
 #include <asm/io.h>

@@ -258,7 +259,7 @@ static const char *EP_IN_NAME;
 static const char *EP_OUT_NAME;
 static const char *EP_NOTIFY_NAME;
 
-static struct semaphore	gs_open_close_sem[GS_NUM_PORTS];
+static struct mutex gs_open_close_lock[GS_NUM_PORTS];
 
 static unsigned int read_q_size = GS_DEFAULT_READ_Q_SIZE;
 static unsigned int write_q_size = GS_DEFAULT_WRITE_Q_SIZE;

@@ -595,7 +596,7 @@ static int __init gs_module_init(void)
 	tty_set_operations(gs_tty_driver, &gs_tty_ops);
 
 	for (i=0; i < GS_NUM_PORTS; i++)
-		sema_init(&gs_open_close_sem[i], 1);
+		mutex_init(&gs_open_close_lock[i]);
 
 	retval = tty_register_driver(gs_tty_driver);
 	if (retval) {

@@ -635,7 +636,7 @@ static int gs_open(struct tty_struct *tty, struct file *file)
 	struct gs_port *port;
 	struct gs_dev *dev;
 	struct gs_buf *buf;
-	struct semaphore *sem;
+	struct mutex *mtx;
 	int ret;
 
 	port_num = tty->index;

@@ -656,10 +657,10 @@ static int gs_open(struct tty_struct *tty, struct file *file)
 		return -ENODEV;
 	}
 
-	sem = &gs_open_close_sem[port_num];
-	if (down_interruptible(sem)) {
+	mtx = &gs_open_close_lock[port_num];
+	if (mutex_lock_interruptible(mtx)) {
 		printk(KERN_ERR
-		"gs_open: (%d,%p,%p) interrupted waiting for semaphore\n",
+		"gs_open: (%d,%p,%p) interrupted waiting for mutex\n",
 			port_num, tty, file);
 		return -ERESTARTSYS;
 	}

@@ -754,12 +755,12 @@ static int gs_open(struct tty_struct *tty, struct file *file)
 
 exit_unlock_port:
 	spin_unlock_irqrestore(&port->port_lock, flags);
-	up(sem);
+	mutex_unlock(mtx);
 	return ret;
 
 exit_unlock_dev:
 	spin_unlock_irqrestore(&dev->dev_lock, flags);
-	up(sem);
+	mutex_unlock(mtx);
 	return ret;
 
 }

@@ -781,7 +782,7 @@ exit_unlock_dev:
 static void gs_close(struct tty_struct *tty, struct file *file)
 {
 	struct gs_port *port = tty->driver_data;
-	struct semaphore *sem;
+	struct mutex *mtx;
 
 	if (port == NULL) {
 		printk(KERN_ERR "gs_close: NULL port pointer\n");

@@ -790,8 +791,8 @@ static void gs_close(struct tty_struct *tty, struct file *file)
 
 	gs_debug("gs_close: (%d,%p,%p)\n", port->port_num, tty, file);
 
-	sem = &gs_open_close_sem[port->port_num];
-	down(sem);
+	mtx = &gs_open_close_lock[port->port_num];
+	mutex_lock(mtx);
 
 	spin_lock_irq(&port->port_lock);
 

@@ -846,7 +847,7 @@ static void gs_close(struct tty_struct *tty, struct file *file)
 
 exit:
 	spin_unlock_irq(&port->port_lock);
-	up(sem);
+	mutex_unlock(mtx);
 }
 
 /*

index e98df2e..7f765ec 100644
@@ -52,6 +52,7 @@
 #include <linux/workqueue.h>
 #include <linux/platform_device.h>
 #include <linux/pci_ids.h>
+#include <linux/mutex.h>
 #include <asm/io.h>
 #include <asm/irq.h>
 #include <asm/system.h>

@@ -83,7 +84,7 @@ static DECLARE_WAIT_QUEUE_HEAD(u132_hcd_wait);
 * u132_module_lock exists to protect access to global variables
 *
 */
-static struct semaphore u132_module_lock;
+static struct mutex u132_module_lock;
 static int u132_exiting = 0;
 static int u132_instances = 0;
 static struct list_head u132_static_list;

@@ -258,10 +259,10 @@ static void u132_hcd_delete(struct kref *kref)
         struct platform_device *pdev = u132->platform_dev;
         struct usb_hcd *hcd = u132_to_hcd(u132);
         u132->going += 1;
-        down(&u132_module_lock);
+        mutex_lock(&u132_module_lock);
         list_del_init(&u132->u132_list);
         u132_instances -= 1;
-        up(&u132_module_lock);
+        mutex_unlock(&u132_module_lock);
         dev_warn(&u132->platform_dev->dev, "FREEING the hcd=%p and thus the u13"
                 "2=%p going=%d pdev=%p\n", hcd, u132, u132->going, pdev);
         usb_put_hcd(hcd);

@@ -3111,10 +3112,10 @@ static int __devinit u132_probe(struct platform_device *pdev)
                 int retval = 0;
                 struct u132 *u132 = hcd_to_u132(hcd);
                 hcd->rsrc_start = 0;
-                down(&u132_module_lock);
+                mutex_lock(&u132_module_lock);
                 list_add_tail(&u132->u132_list, &u132_static_list);
                 u132->sequence_num = ++u132_instances;
-                up(&u132_module_lock);
+                mutex_unlock(&u132_module_lock);
                 u132_u132_init_kref(u132);
                 u132_initialise(u132, pdev);
                 hcd->product_desc = "ELAN U132 Host Controller";

@@ -3216,7 +3217,7 @@ static int __init u132_hcd_init(void)
         INIT_LIST_HEAD(&u132_static_list);
         u132_instances = 0;
         u132_exiting = 0;
-        init_MUTEX(&u132_module_lock);
+        mutex_init(&u132_module_lock);
         if (usb_disabled())
                 return -ENODEV;
         printk(KERN_INFO "driver %s built at %s on %s\n", hcd_name, __TIME__,

@@ -3232,9 +3233,9 @@ static void __exit u132_hcd_exit(void)
 {
         struct u132 *u132;
         struct u132 *temp;
-        down(&u132_module_lock);
+        mutex_lock(&u132_module_lock);
         u132_exiting += 1;
-        up(&u132_module_lock);
+        mutex_unlock(&u132_module_lock);
         list_for_each_entry_safe(u132, temp, &u132_static_list, u132_list) {
                 platform_device_unregister(u132->platform_dev);
         } platform_driver_unregister(&u132_platform_driver);

index d72c42e..274d08e 100644
@@ -24,6 +24,7 @@
 #include <linux/slab.h>
 #include <linux/module.h>
 #include <linux/usb.h>
+#include <linux/mutex.h>
 #include <asm/uaccess.h>
 
 #ifdef CONFIG_USB_DEBUG

@@ -80,7 +81,7 @@ MODULE_DEVICE_TABLE(usb, device_table);
 
 /* Structure to hold all of our device specific stuff */
 struct adu_device {
-	struct semaphore	sem; /* locks this structure */
+	struct mutex		mtx; /* locks this structure */
 	struct usb_device*	udev; /* save off the usb device pointer */
 	struct usb_interface*	interface;
 	unsigned char		minor; /* the starting minor number for this device */

@@ -269,8 +270,8 @@ static int adu_open(struct inode *inode, struct file *file)
 	}
 
 	/* lock this device */
-	if ((retval = down_interruptible(&dev->sem))) {
-		dbg(2, "%s : sem down failed", __FUNCTION__);
+	if ((retval = mutex_lock_interruptible(&dev->mtx))) {
+		dbg(2, "%s : mutex lock failed", __FUNCTION__);
 		goto exit_no_device;
 	}
 

@@ -299,7 +300,7 @@ static int adu_open(struct inode *inode, struct file *file)
 		if (retval)
 			--dev->open_count;
 	}
-	up(&dev->sem);
+	mutex_unlock(&dev->mtx);
 
 exit_no_device:
 	dbg(2,"%s : leave, return value %d ", __FUNCTION__, retval);

@@ -347,7 +348,7 @@ static int adu_release(struct inode *inode, struct file *file)
 	}
 
 	/* lock our device */
-	down(&dev->sem); /* not interruptible */
+	mutex_lock(&dev->mtx); /* not interruptible */
 
 	if (dev->open_count <= 0) {
 		dbg(1," %s : device not opened", __FUNCTION__);

@@ -357,7 +358,7 @@ static int adu_release(struct inode *inode, struct file *file)
 
 	if (dev->udev == NULL) {
 		/* the device was unplugged before the file was released */
-		up(&dev->sem);
+		mutex_unlock(&dev->mtx);
 		adu_delete(dev);
 		dev = NULL;
 	} else {

@@ -367,7 +368,7 @@ static int adu_release(struct inode *inode, struct file *file)
 
 exit:
 	if (dev)
-		up(&dev->sem);
+		mutex_unlock(&dev->mtx);
 	dbg(2," %s : leave, return value %d", __FUNCTION__, retval);
 	return retval;
 }

@@ -390,7 +391,7 @@ static ssize_t adu_read(struct file *file, __user char *buffer, size_t count,
 	dev = file->private_data;
 	dbg(2," %s : dev=%p", __FUNCTION__, dev);
 	/* lock this object */
-	if (down_interruptible(&dev->sem))
+	if (mutex_lock_interruptible(&dev->mtx))
 		return -ERESTARTSYS;
 
 	/* verify that the device wasn't unplugged */

@@ -522,7 +523,7 @@ static ssize_t adu_read(struct file *file, __user char *buffer, size_t count,
 
 exit:
 	/* unlock the device */
-	up(&dev->sem);
+	mutex_unlock(&dev->mtx);
 
 	dbg(2," %s : leave, return value %d", __FUNCTION__, retval);
 	return retval;

@@ -543,7 +544,7 @@ static ssize_t adu_write(struct file *file, const __user char *buffer,
 	dev = file->private_data;
 
 	/* lock this object */
-	retval = down_interruptible(&dev->sem);
+	retval = mutex_lock_interruptible(&dev->mtx);
 	if (retval)
 		goto exit_nolock;
 

@@ -571,9 +572,9 @@ static ssize_t adu_write(struct file *file, const __user char *buffer,
 				retval = -EINTR;
 				goto exit;
 			}
-			up(&dev->sem);
+			mutex_unlock(&dev->mtx);
 			timeout = interruptible_sleep_on_timeout(&dev->write_wait, timeout);
-			retval = down_interruptible(&dev->sem);
+			retval = mutex_lock_interruptible(&dev->mtx);
 			if (retval) {
 				retval = bytes_written ? bytes_written : retval;
 				goto exit_nolock;

@@ -638,7 +639,7 @@ static ssize_t adu_write(struct file *file, const __user char *buffer,
 
 exit:
 	/* unlock the device */
-	up(&dev->sem);
+	mutex_unlock(&dev->mtx);
 exit_nolock:
 
 	dbg(2," %s : leave, return value %d", __FUNCTION__, retval);

@@ -698,7 +699,7 @@ static int adu_probe(struct usb_interface *interface,
 		goto exit;
 	}
 
-	init_MUTEX(&dev->sem);
+	mutex_init(&dev->mtx);
 	spin_lock_init(&dev->buflock);
 	dev->udev = udev;
 	init_waitqueue_head(&dev->read_wait);

@@ -835,16 +836,16 @@ static void adu_disconnect(struct usb_interface *interface)
 	usb_deregister_dev(interface, &adu_class);
 	dev->minor = 0;
 
-	down(&dev->sem); /* not interruptible */
+	mutex_lock(&dev->mtx); /* not interruptible */
 
 	/* if the device is not opened, then we clean up right now */
 	dbg(2," %s : open count %d", __FUNCTION__, dev->open_count);
 	if (!dev->open_count) {
-		up(&dev->sem);
+		mutex_unlock(&dev->mtx);
 		adu_delete(dev);
 	} else {
 		dev->udev = NULL;
-		up(&dev->sem);
+		mutex_unlock(&dev->mtx);
 	}
 
 	dev_info(&interface->dev, "ADU device adutux%d now disconnected",

index e0f122e..7cc6883 100644
@@ -44,6 +44,7 @@
 #include <linux/slab.h>
 #include <linux/module.h>
 #include <linux/kref.h>
+#include <linux/mutex.h>
 #include <asm/uaccess.h>
 #include <linux/usb.h>
 #include <linux/workqueue.h>

@@ -64,7 +65,7 @@ static struct workqueue_struct *respond_queue;
 * ftdi_module_lock exists to protect access to global variables
 *
 */
-static struct semaphore ftdi_module_lock;
+static struct mutex ftdi_module_lock;
 static int ftdi_instances = 0;
 static struct list_head ftdi_static_list;
 /*

@@ -199,10 +200,10 @@ static void ftdi_elan_delete(struct kref *kref)
         dev_warn(&ftdi->udev->dev, "FREEING ftdi=%p\n", ftdi);
         usb_put_dev(ftdi->udev);
         ftdi->disconnected += 1;
-        down(&ftdi_module_lock);
+        mutex_lock(&ftdi_module_lock);
         list_del_init(&ftdi->ftdi_list);
         ftdi_instances -= 1;
-        up(&ftdi_module_lock);
+        mutex_unlock(&ftdi_module_lock);
         kfree(ftdi->bulk_in_buffer);
         ftdi->bulk_in_buffer = NULL;
 }

@@ -2780,10 +2781,10 @@ static int ftdi_elan_probe(struct usb_interface *interface,
                 return -ENOMEM;
         }
         memset(ftdi, 0x00, sizeof(struct usb_ftdi));
-        down(&ftdi_module_lock);
+        mutex_lock(&ftdi_module_lock);
         list_add_tail(&ftdi->ftdi_list, &ftdi_static_list);
         ftdi->sequence_num = ++ftdi_instances;
-        up(&ftdi_module_lock);
+        mutex_unlock(&ftdi_module_lock);
         ftdi_elan_init_kref(ftdi);
         init_MUTEX(&ftdi->sw_lock);
         ftdi->udev = usb_get_dev(interface_to_usbdev(interface));

@@ -2909,7 +2910,7 @@ static int __init ftdi_elan_init(void)
         int result;
         printk(KERN_INFO "driver %s built at %s on %s\n", ftdi_elan_driver.name,
 	       __TIME__, __DATE__);
-        init_MUTEX(&ftdi_module_lock);
+        mutex_init(&ftdi_module_lock);
         INIT_LIST_HEAD(&ftdi_static_list);
         status_queue = create_singlethread_workqueue("ftdi-status-control");
 	if (!status_queue)