ppdev: add support for compat ioctl

The arg of ioctl in ppdev is the pointer of integer except the
timeval in PPSETTIME, PPGETTIME. Different size of timeval
is already supported by the previous patches. So, it is safe
to add compat support.

Signed-off-by: Bamvor Jian Zhang <bamvor.zhangjian@linaro.org>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Tested-by: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/char/ppdev.c b/drivers/char/ppdev.c
index c03d998731ea1bb6e26694a615d74b8e78b9d5f1..9e98d015314815d651b3dc331be037afc9e787ca 100644 (file)
--- a/drivers/char/ppdev.c
+++ b/drivers/char/ppdev.c
@@ -69,6 +69,7 @@
 #include <linux/ppdev.h>
 #include <linux/mutex.h>
 #include <linux/uaccess.h>
+#include <linux/compat.h>
 
 #define PP_VERSION "ppdev: user-space parallel port driver"
 #define CHRDEV "ppdev"
@@ -670,6 +671,14 @@ static long pp_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
        return ret;
 }
 
+#ifdef CONFIG_COMPAT
+static long pp_compat_ioctl(struct file *file, unsigned int cmd,
+               unsigned long arg)
+{
+       return pp_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
+}
+#endif
+
 static int pp_open (struct inode * inode, struct file * file)
 {
        unsigned int minor = iminor(inode);
@@ -779,6 +788,9 @@ static const struct file_operations pp_fops = {
        .write          = pp_write,
        .poll           = pp_poll,
        .unlocked_ioctl = pp_ioctl,
+#ifdef CONFIG_COMPAT
+       .compat_ioctl   = pp_compat_ioctl,
+#endif
        .open           = pp_open,
        .release        = pp_release,
 };