Am Freitag, 20. November 2009 22:22:59 schrieb Dmitry Torokhov:
> Hi Oliver,
>
> On Fri, Nov 20, 2009 at 10:13:47PM +0100, Oliver Neukum wrote:
> > Hi,
> >
> > an open() between killing the urb and unregistering the device
> > can lead to IO to a disconnected device.
>
> usbtouch_close() calls usb_kill_urb() so there is no race.
> usb_kill_urb() simply not needed in usbtouch_disconnect().
Then it needs to go.
Signed-off-by: Oliver Neukum <oliver@xxxxxxxxxx>
Regards
Oliver
--
commit 2705666144b8c898283974efc59fd5182e13e652
Author: Oliver Neukum <oliver@xxxxxxxxxx>
Date: Fri Nov 20 22:41:04 2009 +0100
usbtouchscreen:remove unneeded usb_kill_urb
usb_kill_urb() in disconnect is not needed as unregistering
cause close to be called
diff --git a/drivers/input/touchscreen/usbtouchscreen.c b/drivers/input/touchscreen/usbtouchscreen.c
index 68ece58..eddb628 100644
--- a/drivers/input/touchscreen/usbtouchscreen.c
+++ b/drivers/input/touchscreen/usbtouchscreen.c
@@ -1087,7 +1087,7 @@ static void usbtouch_disconnect(struct usb_interface *intf)
dbg("%s - usbtouch is initialized, cleaning up", __func__);
usb_set_intfdata(intf, NULL);
- usb_kill_urb(usbtouch->irq);
+ /* this will stop IO via close */
input_unregister_device(usbtouch->input);
usb_free_urb(usbtouch->irq);
usbtouch_free_buffers(interface_to_usbdev(intf), usbtouch);
--
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