airo: use simple_write_to_buffer

Simplify write file operation for /proc files by using
simple_write_to_buffer().

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: "John W. Linville" <linville@tuxdriver.com>
Cc: linux-wireless@vger.kernel.org
Cc: netdev@vger.kernel.org
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/airo.c b/drivers/net/wireless/airo.c
index a36e787..57a79b0 100644 (file)
--- a/drivers/net/wireless/airo.c
+++ b/drivers/net/wireless/airo.c
@@ -4652,24 +4652,18 @@ static ssize_t proc_write( struct file *file,
                           size_t len,
                           loff_t *offset )
 {
-       loff_t pos = *offset;
+       ssize_t ret;
        struct proc_data *priv = file->private_data;
 
        if (!priv->wbuffer)
                return -EINVAL;
 
-       if (pos < 0)
-               return -EINVAL;
-       if (pos >= priv->maxwritelen)
-               return 0;
-       if (len > priv->maxwritelen - pos)
-               len = priv->maxwritelen - pos;
-       if (copy_from_user(priv->wbuffer + pos, buffer, len))
-               return -EFAULT;
-       if ( pos + len > priv->writelen )
-               priv->writelen = len + file->f_pos;
-       *offset = pos + len;
-       return len;
+       ret = simple_write_to_buffer(priv->wbuffer, priv->maxwritelen, offset,
+                                       buffer, len);
+       if (ret > 0)
+               priv->writelen = max_t(int, priv->writelen, *offset);
+
+       return ret;
 }
 
 static int proc_status_open(struct inode *inode, struct file *file)