commit dae3ddba36f8c337fb59cef07d564da6fc9b7551
author Tobias Herzog <t-herzog@gmx.de> Sat Sep 22 22:11:10 2018 +0200
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> Tue Oct 09 16:13:42 2018 +0200
tree 817ca4e62e0e4e9976c96a24dc18d0cbc40917a7
parent 9397940ed812b942c520e0c25ed4b2c64d57e8b9

cdc-acm: do not reset notification buffer index upon urb unlinking

Resetting the write index of the notification buffer on urb unlink (e.g.
closing a cdc-acm device from userspace) may lead to wrong interpretation
of further received notifications, in case the index is not 0 when urb
unlink happens (i.e. when parts of a notification already have been
transferred). On the device side there is no "reset" of the notification
transimission and thus we would get out of sync with the device.

Signed-off-by: Tobias Herzog <t-herzog@gmx.de>
Acked-by: Oliver Neukum <oneukum@suse.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>