From: Jean Delvare <khali@linux-fr.org>
Date: Sun, 10 Dec 2006 20:21:30 +0000 (+0100)
Subject: i2c: Use put_user instead of copy_to_user where possible
X-Git-Tag: v2.6.20-rc1~146^2~2^2~10
X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=2c003e8e1c0c241aec162ba9ec781089c5b2ff3f;p=linux-2.6-omap-h63xx.git

i2c: Use put_user instead of copy_to_user where possible

This speeds up the I2C_FUNCS ioctl by 5 to 8% in my tests.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Laughed-at-by: Mark M. Hoffman <mhoffman@lightlink.com>
---

diff --git a/drivers/i2c/i2c-dev.c b/drivers/i2c/i2c-dev.c
index 2e22a2ffa60..d66cefc63df 100644
--- a/drivers/i2c/i2c-dev.c
+++ b/drivers/i2c/i2c-dev.c
@@ -193,8 +193,7 @@ static int i2cdev_ioctl(struct inode *inode, struct file *file,
 		return 0;
 	case I2C_FUNCS:
 		funcs = i2c_get_functionality(client->adapter);
-		return (copy_to_user((unsigned long __user *)arg, &funcs,
-		                     sizeof(unsigned long)))?-EFAULT:0;
+		return put_user(funcs, (unsigned long __user *)arg);
 
 	case I2C_RDWR:
 		if (copy_from_user(&rdwr_arg,