How is supposed to be protected the units list?

Matthew Jacob mj at
Tue Mar 2 15:34:41 UTC 2010

I will admit to not looking at this stuff closely. But I'll also test 
with this today and give back an opinion.
I would really like to hear Scott, Ken, Alexander or Justin express an 
opinion on this.

> 2010/3/1 Attilio Rao<attilio at>:
>> Hello,
>> I have a question that I've been unable to reply reading the code.
>> Someone could point me to documentation explaining how the unit tailq
>> (within a struct periph_driver) is supposed to be locked?
>> I'm not sure how it is assured consistency of accesses to the list and
>> more important how is ensured that the periphs composing it doesn't go
>> away as I don't see any reference bump for objects inserted there.
> I don't think the lists are protected at all so I made this simple
> patch taking advantage by a global lock:
> The patch is simple enough but I just test-compiled it (will need some
> time to run in a debugging kernel, hope to do tonight) and maybe you
> can already give your opinions here.
> Thanks,
> Attilio

More information about the freebsd-scsi mailing list