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>

1 files changed, 7 insertions, 13 deletions

diff --git a/drivers/net/wireless/airo.c b/drivers/net/wireless/airo.c
index a36e7870b03e..57a79b0475f6 100644
--- 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)