openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

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>
This commit is contained in:
Jean Delvare 2006-12-10 21:21:30 +01:00 committed by Jean Delvare
parent 813e30e9ab
commit 2c003e8e1c
1 changed files with 1 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/i2c/i2c-dev.c
View File

@ -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,