1 files changed, 15 insertions, 26 deletions

diff --git a/drivers/s390/char/tape_char.c b/drivers/s390/char/tape_char.c
index ea4253939555..8abb42923307 100644
--- a/drivers/s390/char/tape_char.c
+++ b/drivers/s390/char/tape_char.c
@@ -341,14 +341,14 @@ tapechar_release(struct inode *inode, struct file *filp)
  */
 static int
 __tapechar_ioctl(struct tape_device *device,
-		 unsigned int no, unsigned long data)
+		 unsigned int no, void __user *data)
 {
 	int rc;
 
 	if (no == MTIOCTOP) {
 		struct mtop op;
 
-		if (copy_from_user(&op, (char __user *) data, sizeof(op)) != 0)
+		if (copy_from_user(&op, data, sizeof(op)) != 0)
 			return -EFAULT;
 		if (op.mt_count < 0)
 			return -EINVAL;
@@ -392,9 +392,7 @@ __tapechar_ioctl(struct tape_device *device,
 		if (rc < 0)
 			return rc;
 		pos.mt_blkno = rc;
-		if (copy_to_user((char __user *) data, &pos, sizeof(pos)) != 0)
-			return -EFAULT;
-		return 0;
+		return put_user_mtpos(data, &pos);
 	}
 	if (no == MTIOCGET) {
 		/* MTIOCGET: query the tape drive status. */
@@ -424,15 +422,12 @@ __tapechar_ioctl(struct tape_device *device,
 			get.mt_blkno = rc;
 		}
 
-		if (copy_to_user((char __user *) data, &get, sizeof(get)) != 0)
-			return -EFAULT;
-
-		return 0;
+		return put_user_mtget(data, &get);
 	}
 	/* Try the discipline ioctl function. */
 	if (device->discipline->ioctl_fn == NULL)
 		return -EINVAL;
-	return device->discipline->ioctl_fn(device, no, data);
+	return device->discipline->ioctl_fn(device, no, (unsigned long)data);
 }
 
 static long
@@ -445,7 +440,7 @@ tapechar_ioctl(struct file *filp, unsigned int no, unsigned long data)
 
 	device = (struct tape_device *) filp->private_data;
 	mutex_lock(&device->mutex);
-	rc = __tapechar_ioctl(device, no, data);
+	rc = __tapechar_ioctl(device, no, (void __user *)data);
 	mutex_unlock(&device->mutex);
 	return rc;
 }
@@ -455,23 +450,17 @@ static long
 tapechar_compat_ioctl(struct file *filp, unsigned int no, unsigned long data)
 {
 	struct tape_device *device = filp->private_data;
-	int rval = -ENOIOCTLCMD;
-	unsigned long argp;
+	long rc;
 
-	/* The 'arg' argument of any ioctl function may only be used for
-	 * pointers because of the compat pointer conversion.
-	 * Consider this when adding new ioctls.
-	 */
-	argp = (unsigned long) compat_ptr(data);
-	if (device->discipline->ioctl_fn) {
-		mutex_lock(&device->mutex);
-		rval = device->discipline->ioctl_fn(device, no, argp);
-		mutex_unlock(&device->mutex);
-		if (rval == -EINVAL)
-			rval = -ENOIOCTLCMD;
-	}
+	if (no == MTIOCPOS32)
+		no = MTIOCPOS;
+	else if (no == MTIOCGET32)
+		no = MTIOCGET;
 
-	return rval;
+	mutex_lock(&device->mutex);
+	rc = __tapechar_ioctl(device, no, compat_ptr(data));
+	mutex_unlock(&device->mutex);
+	return rc;
 }
 #endif /* CONFIG_COMPAT */