linux-kernel - [PATCH 4.6 28/31] USB: mos7720: delete parport

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Date:	Wed,  6 Jul 2016 18:19:18 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org,
	Sudip Mukherjee <sudip.mukherjee@...ethink.co.uk>
Subject: [PATCH 4.6 28/31] USB: mos7720: delete parport

4.6-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Sudip Mukherjee <sudipm.mukherjee@...il.com>

commit dcb21ad4385731b7fc3ef39d255685f2f63c8c5d upstream.

parport subsystem has introduced parport_del_port() to delete a port
when it is going away. Without parport_del_port() the registered port
will not be unregistered.
To reproduce and verify the error:
Command to be used is : ls /sys/bus/parport/devices
1) without the device attached there is no output as there is no
registered parport.
2) Attach the device, and the command will show "parport0".
3) Remove the device and the command still shows "parport0".
4) Attach the device again and we get "parport1".

With the patch applied:
1) without the device attached there is no output as there is no
registered parport.
2) Attach the device, and the command will show "parport0".
3) Remove the device and there is no output as "parport0" is now
removed.
4) Attach device again to get "parport0" again.

Signed-off-by: Sudip Mukherjee <sudip.mukherjee@...ethink.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/usb/serial/mos7720.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/usb/serial/mos7720.c
+++ b/drivers/usb/serial/mos7720.c
@@ -2007,6 +2007,7 @@ static void mos7720_release(struct usb_s
 				    urblist_entry)
 			usb_unlink_urb(urbtrack->urb);
 		spin_unlock_irqrestore(&mos_parport->listlock, flags);
+		parport_del_port(mos_parport->pp);

 		kref_put(&mos_parport->ref_count, destroy_mos_parport);
 	}