Re: [GPIO]implement sleeping GPIO chip removal

[Thomas Gleixner <tglx@linutronix.de>]

On Wed, 10 Nov 2010, Maciej Szmigiero wrote:
> W dniu 10.11.2010 10:49, Thomas Gleixner pisze:
> > Maybe because it open codes a sloppy refcounting with a loop and magic
> > sleeps instead of converting the code to kobjects and proper
> > refcounting ?
> > 
> 
> The only way to do GPIO chip removal in the current code is to busy-loop.
> "Sloppy" (as you called it) waiting is still more CPU-friendly than looping 
> in hope that somebody will finally release the chip.
> If you would like to implement it as kobject then go ahead and post the code
> so it can be used in drivers.

Wait a moment. You are getting something backwards here.

Fact is that the current code is not designed for easy hotunplugging
and therefor requires looping.

So _you_ propose a work-around to replace the busy-loop by a sleeping
loop with "hope that ....". Hope is the least thing what counts in
programming.

Now a reviewer tells you that your idea of replacing the busy-loop by
a sleeping in hope loop is flawed, because it does not solve the
underlying design problem of the GPIO code. And you get a suggestion
how to solve it correctly.

Now you go and request from that reviewer to implement that? That's
not how it works.

You sent a flawed patch in the first place and people try to tell you
how to do it right. Then it's on you to either go and do it right or
at least ask politely for help and pointers.

Thanks,

	tglx