Hi, > > When two instances of uart devices are probing, a concurrency race can > > occur. > > > > Adding a mutex lock around the uart_register_driver call in the probe > > function prevents this race condition and ensures that the uart driver > > structure is fully initialized and registered before it is used. > > So the problem that there is a single "state" for the driver as a whole. > That should be fixed up to be local to each individual device that is > added to the system. Don't add a lock to paper over this as odds are > this is not the only place that will have problems. > > Are you just now having 2 of these devices in your system at the same > time? In the past I have created a Zynq 7000 based system (dual core ARM) with 11 uartlites and I have not seen this problem. This was with a 5.10 kernel. Maarten
