linux-kernel - [RFC PATCH v2 3/4] ppdev: add compat ioctl

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Date:	Mon, 29 Jun 2015 22:23:26 +0800
From:	Bamvor Zhang Jian <bamvor.zhangjian@...aro.org>
To:	arnd@...db.de, john.stultz@...aro.org, tglx@...utronix.de
Cc:	y2039@...ts.linaro.org, linux-kernel@...r.kernel.org,
	bamvor.zhangjian@...aro.org
Subject: [RFC PATCH v2 3/4] ppdev: add compat ioctl

Add compat ioctl in ppdev in order to solve the y2038 issue in
later patch.
This patch simply add pp_do_ioctl to compat_ioctl, because I found
that all the ioctl access the arg as a pointer.

Signed-off-by: Bamvor Zhang Jian <bamvor.zhangjian@...aro.org>
---
 drivers/char/ppdev.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/char/ppdev.c b/drivers/char/ppdev.c
index ae0b42b..9207658 100644
--- 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"
@@ -635,6 +636,11 @@ static long pp_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 	return ret;
 }
 
+static long pp_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+	return pp_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
+}
+
 static int pp_open (struct inode * inode, struct file * file)
 {
 	unsigned int minor = iminor(inode);
@@ -744,6 +750,9 @@ 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,
 };
-- 
2.1.4

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