Re: [linux-usb-devel] Re: bug 2400

[David Brownell <david-b@pacbell.net>]

James Bottomley wrote:
>>> that's intra subsystem synchronisation, not inter subsystem
>>
>>I'd say that device_driver.remove() calls from the bus management
>>code to a given device driver are inter-subsystem...
> 
> so using a subsystem provided API from another subsystem constitutes
> inter subsytem synchronisation?  I don't think so.

So it's now "I won't listen to those facts, they bother me" ...
Or maybe you're just trolling?  "From another subsystem" is
"between subsystems" is "inter-subsystem"; Q.E.D.

Either way, it's not worth the time to respond to you any more,
this will be my last post on this thread.


>>Refcounting systems need loop-breaking protocols ("disconnect");
>>this is needed for that sort of reason, if no other.
> 
> 
> No, they don't.

Without protocols for breaking referencing loops, systems that
use refcounting _alone_ (as you're advocating) leak memory unless
they prevent such loops ... but requests sent from one subsystem
to the next, then later returned, each embed such a loop.

That's in addition to the need for locking in certain paths,
on multi-threaded systems (like Linux).

(And for that matter, there were no WMDs in Iraq.)

Sorry for mentioning all those inconvenient facts;
I'll go away now.