Johan de Jong wrote: > In the mean time I have applied and tested the 2013 patch by Otto Meta: > > http://marc.info/?l=linux-scsi&m=135705061804384&w=2 > > which, in short, replaces mutex_lock(&sr_mutex) (global mutex), that > was introduced in 2010 to replace lock_kernel(), by per-device mutexes > and allowing concurrent ioctl(SG_IO) in different processes with > different sr devices.
There seems to be a few patches floating around. I've had one running on 3.3.0 for a long time w/o any issues. I'm currently using the one from Tim Small (Search for subject Fix performance burning or extracting audio etc. from multiple optical drives.) on 4.x (where x is 3-4) and a 3.14.something without any issues. I still have the emails from Tim. My current usage is 2 systems with 3 burners from the same source.
