On Sa, 2018-09-22 at 22:11 +0200, Tobias Herzog wrote: > 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. Hi, you are right, when you are describing the problem. The fix seems to me to fix a part, albeit a large part of the issue. As far as I can tell, the transfer could be partially succesful, meaning that the driver loses a part in the middle of the notification. Regards Oliver
