USB: auerswald: Convert ccp->mutex in a mutex

The semaphore ccp->mutex is used as mutex, convert it to the mutex API
Signed-off-by: Matthias Kaehlcke <matthias@kaehlcke.net>
Cc: Wolfgang Mües <wolfgang@iksw-muees.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/misc/auerswald.c

@@ -254,7 +254,7 @@ typedef struct
 /* character device context */
 typedef struct
 {
-	struct semaphore mutex;         /* protection in user context */
+	struct mutex mutex;		/* protection in user context */
 	pauerswald_t auerdev;           /* context pointer of assigned device */
         auerbufctl_t bufctl;            /* controls the buffer chain */
         auerscon_t scontext;            /* service context */
@@ -1390,7 +1390,7 @@ static int auerchar_open (struct inode *inode, struct file *file)
 	}
 
 	/* Initialize device descriptor */
-	init_MUTEX( &ccp->mutex);
+	mutex_init(&ccp->mutex);
 	mutex_init(&ccp->readmutex);
         auerbuf_init (&ccp->bufctl);
         ccp->scontext.id = AUH_UNASSIGNED;
@@ -1433,23 +1433,23 @@ static int auerchar_ioctl (struct inode *inode, struct file *file, unsigned int
         dbg ("ioctl");
 
 	/* get the mutexes */
-	if (down_interruptible (&ccp->mutex)) {
+	if (mutex_lock_interruptible(&ccp->mutex)) {
 		return -ERESTARTSYS;
 	}
 	cp = ccp->auerdev;
 	if (!cp) {
-		up (&ccp->mutex);
+		mutex_unlock(&ccp->mutex);
                 return -ENODEV;
 	}
 	if (mutex_lock_interruptible(&cp->mutex)) {
-		up(&ccp->mutex);
+		mutex_unlock(&ccp->mutex);
 		return -ERESTARTSYS;
 	}
 
 	/* Check for removal */
 	if (!cp->usbdev) {
 		mutex_unlock(&cp->mutex);
-		up(&ccp->mutex);
+		mutex_unlock(&ccp->mutex);
                 return -ENODEV;
 	}
 
@@ -1552,7 +1552,7 @@ static int auerchar_ioctl (struct inode *inode, struct file *file, unsigned int
         }
 	/* release the mutexes */
 	mutex_unlock(&cp->mutex);
-	up(&ccp->mutex);
+	mutex_unlock(&ccp->mutex);
 	return ret;
 }
 
@@ -1575,18 +1575,18 @@ static ssize_t auerchar_read (struct file *file, char __user *buf, size_t count,
 		return 0;
 
 	/* get the mutex */
-	if (down_interruptible (&ccp->mutex))
+	if (mutex_lock_interruptible(&ccp->mutex))
 		return -ERESTARTSYS;
 
 	/* Can we expect to read something? */
 	if (ccp->scontext.id == AUH_UNASSIGNED) {
-		up (&ccp->mutex);
+		mutex_unlock(&ccp->mutex);
                 return -EIO;
 	}
 
 	/* only one reader per device allowed */
 	if (mutex_lock_interruptible(&ccp->readmutex)) {
-		up (&ccp->mutex);
+		mutex_unlock(&ccp->mutex);
 		return -ERESTARTSYS;
 	}
 
@@ -1604,7 +1604,7 @@ static ssize_t auerchar_read (struct file *file, char __user *buf, size_t count,
 			if (copy_to_user (buf, bp->bufp+ccp->readoffset, count)) {
 				dbg ("auerswald_read: copy_to_user failed");
 				mutex_unlock(&ccp->readmutex);
-				up (&ccp->mutex);
+				mutex_unlock(&ccp->mutex);
 				return -EFAULT;
 			}
 		}
@@ -1619,7 +1619,7 @@ static ssize_t auerchar_read (struct file *file, char __user *buf, size_t count,
 		/* return with number of bytes read */
 		if (count) {
 			mutex_unlock(&ccp->readmutex);
-			up (&ccp->mutex);
+			mutex_unlock(&ccp->mutex);
 			return count;
 		}
 	}
@@ -1656,12 +1656,12 @@ static ssize_t auerchar_read (struct file *file, char __user *buf, size_t count,
 		set_current_state (TASK_RUNNING);
 		remove_wait_queue (&ccp->readwait, &wait);
 		mutex_unlock(&ccp->readmutex);
-		up (&ccp->mutex);
+		mutex_unlock(&ccp->mutex);
 		return -EAGAIN;  /* nonblocking, no data available */
         }
 
 	/* yes, we should wait! */
-	up (&ccp->mutex); /* allow other operations while we wait */
+	mutex_unlock(&ccp->mutex); /* allow other operations while we wait */
 	schedule();
 	remove_wait_queue (&ccp->readwait, &wait);
 	if (signal_pending (current)) {
@@ -1676,7 +1676,7 @@ static ssize_t auerchar_read (struct file *file, char __user *buf, size_t count,
 		return -EIO;
 	}
 
-	if (down_interruptible (&ccp->mutex)) {
+	if (mutex_lock_interruptible(&ccp->mutex)) {
 		mutex_unlock(&ccp->readmutex);
 		return -ERESTARTSYS;
 	}
@@ -1708,27 +1708,27 @@ static ssize_t auerchar_write (struct file *file, const char __user *buf, size_t
 
 write_again:
 	/* get the mutex */
-	if (down_interruptible (&ccp->mutex))
+	if (mutex_lock_interruptible(&ccp->mutex))
 		return -ERESTARTSYS;
 
 	/* Can we expect to write something? */
 	if (ccp->scontext.id == AUH_UNASSIGNED) {
-		up (&ccp->mutex);
+		mutex_unlock(&ccp->mutex);
                 return -EIO;
 	}
 
 	cp = ccp->auerdev;
 	if (!cp) {
-		up (&ccp->mutex);
+		mutex_unlock(&ccp->mutex);
 		return -ERESTARTSYS;
 	}
 	if (mutex_lock_interruptible(&cp->mutex)) {
-		up (&ccp->mutex);
+		mutex_unlock(&ccp->mutex);
 		return -ERESTARTSYS;
 	}
 	if (!cp->usbdev) {
 		mutex_unlock(&cp->mutex);
-		up (&ccp->mutex);
+		mutex_unlock(&ccp->mutex);
 		return -EIO;
 	}
 	/* Prepare for sleep */
@@ -1752,7 +1752,7 @@ static ssize_t auerchar_write (struct file *file, const char __user *buf, size_t
 	/* are there any buffers left? */
 	if (!bp) {
 		mutex_unlock(&cp->mutex);
-		up (&ccp->mutex);
+		mutex_unlock(&ccp->mutex);
 
 		/* NONBLOCK: don't wait */
 		if (file->f_flags & O_NONBLOCK) {
@@ -1785,7 +1785,7 @@ static ssize_t auerchar_write (struct file *file, const char __user *buf, size_t
 		/* Wake up all processes waiting for a buffer */
 		wake_up (&cp->bufferwait);
 		mutex_unlock(&cp->mutex);
-		up (&ccp->mutex);
+		mutex_unlock(&ccp->mutex);
 		return -EFAULT;
 	}
 
@@ -1810,12 +1810,12 @@ static ssize_t auerchar_write (struct file *file, const char __user *buf, size_t
 		auerbuf_releasebuf (bp);
 		/* Wake up all processes waiting for a buffer */
 		wake_up (&cp->bufferwait);
-		up (&ccp->mutex);
+		mutex_unlock(&ccp->mutex);
 		return -EIO;
 	}
 	else {
 		dbg ("auerchar_write: Write OK");
-		up (&ccp->mutex);
+		mutex_unlock(&ccp->mutex);
 		return len;
 	}
 }
@@ -1828,7 +1828,7 @@ static int auerchar_release (struct inode *inode, struct file *file)
 	pauerswald_t cp;
 	dbg("release");
 
-	down(&ccp->mutex);
+	mutex_lock(&ccp->mutex);
 	cp = ccp->auerdev;
 	if (cp) {
 		mutex_lock(&cp->mutex);
@@ -1845,7 +1845,7 @@ static int auerchar_release (struct inode *inode, struct file *file)
 		cp = NULL;
 		ccp->auerdev = NULL;
 	}
-	up (&ccp->mutex);
+	mutex_unlock(&ccp->mutex);
 	auerchar_delete (ccp);
 
 	return 0;