-ENODEV in skel_release in usb skeleton driver

[Amit Nagal <helloin.amit@xxxxxxxxx>]

Hi ,

while going through skel_release() code in usb-skeleton driver , i
noticed the following statements :

static int skel_release(struct inode *inode, struct file *file)
{
        struct usb_skel *dev;

        dev = file->private_data;

        if (dev == NULL)
                return -ENODEV;

        .......
}

but i am trying to understand the scenario  where ( dev == NULL ) can
come true and  skel_release() returns -ENODEV .

since in  skel_open() , file->private_data saves dev  with  (
file->private_data = dev )  statement  ,

and dev is always released either in skel_disconnect (in case no open
) or in release function ( on last close ),

in what scenario dev can go NULL when userspace application calls close() .

Plz  let me know about use case required for presence of above statements .

Regards
Amit Nagal
--
To unsubscribe from this list: send the line "unsubscribe linux-usb" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html