1 files changed, 4 insertions, 8 deletions

diff --git a/arch/um/drivers/mmapper_kern.c b/arch/um/drivers/mmapper_kern.c
index 7158393b6793..c0ef803c7c70 100644
--- a/arch/um/drivers/mmapper_kern.c
+++ b/arch/um/drivers/mmapper_kern.c
@@ -37,13 +37,7 @@ static ssize_t mmapper_write(struct file *file, const char __user *buf,
         if (*ppos > mmapper_size)
                 return -EINVAL;
 
-        if (count > mmapper_size - *ppos)
-                count = mmapper_size - *ppos;
-
-        if (copy_from_user(&v_buf[*ppos], buf, count))
-                return -EFAULT;
-
-        return count;
+        return simple_write_to_buffer(v_buf, mmapper_size, ppos, buf, count);
 }
 
 static long mmapper_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
@@ -93,6 +87,7 @@ static const struct file_operations mmapper_fops = {
         .mmap           = mmapper_mmap,
         .open           = mmapper_open,
         .release        = mmapper_release,
+        .llseek         = default_llseek,
 };
 
 /*
@@ -121,7 +116,7 @@ static int __init mmapper_init(void)
         if (err) {
                 printk(KERN_ERR "mmapper - misc_register failed, err = %d\n",
                        err);
-                return err;;
+                return err;
         }
         return 0;
 }
@@ -136,3 +131,4 @@ module_exit(mmapper_exit);
 
 MODULE_AUTHOR("Greg Lonnon <glonnon@ridgerun.com>");
 MODULE_DESCRIPTION("DSPLinux simulator mmapper driver");
+MODULE_LICENSE("GPL");