[S390] tape_char: add missing compat_ptr conversion
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/drivers/s390/char/tape_char.c b/drivers/s390/char/tape_char.c
index 2125ec7..539045a 100644
--- a/drivers/s390/char/tape_char.c
+++ b/drivers/s390/char/tape_char.c
@@ -18,6 +18,7 @@
#include <linux/proc_fs.h>
#include <linux/mtio.h>
#include <linux/smp_lock.h>
+#include <linux/compat.h>
#include <asm/uaccess.h>
@@ -37,8 +38,9 @@
static int tapechar_open(struct inode *,struct file *);
static int tapechar_release(struct inode *,struct file *);
static long tapechar_ioctl(struct file *, unsigned int, unsigned long);
-static long tapechar_compat_ioctl(struct file *, unsigned int,
- unsigned long);
+#ifdef CONFIG_COMPAT
+static long tapechar_compat_ioctl(struct file *, unsigned int, unsigned long);
+#endif
static const struct file_operations tape_fops =
{
@@ -46,7 +48,9 @@
.read = tapechar_read,
.write = tapechar_write,
.unlocked_ioctl = tapechar_ioctl,
+#ifdef CONFIG_COMPAT
.compat_ioctl = tapechar_compat_ioctl,
+#endif
.open = tapechar_open,
.release = tapechar_release,
};
@@ -457,15 +461,22 @@
return rc;
}
+#ifdef CONFIG_COMPAT
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;
+ /* 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, data);
+ rval = device->discipline->ioctl_fn(device, no, argp);
mutex_unlock(&device->mutex);
if (rval == -EINVAL)
rval = -ENOIOCTLCMD;
@@ -473,6 +484,7 @@
return rval;
}
+#endif /* CONFIG_COMPAT */
/*
* Initialize character device frontend.