Re: [lm-sensors] [PATCH] hwmon class driver registration with adevice number

From: Guenter Roeck
Date: Thu Oct 06 2011 - 15:10:20 EST

On Thu, Oct 06, 2011 at 02:25:00PM -0400, Greg KH wrote:
> On Thu, Oct 06, 2011 at 09:40:11AM +0530, Himanshu Chauhan wrote:
> > Hi Greg,
> >
> > >
> > > How do you later remove a device created with this new interface? As it
> > > is, I think the existing calls will fail, right?
> > >
> > If I have not missed out anything from hwmon_device_unregister(), it shouldn't
> > fail. Why did you point that out?
> If you create a device with a call to device_create() with a dev_t set,
> it is usually cleaned up with a call to device_destroy(), but you are
> right, a simple call to device_unregister() will still work properly.
> So nevermind, sorry for the noise.
Not entirely noise. Since the new registration call is not exported in the patch,
any code using it won't be compilable as module, which in turn means
that hwmon_device_unregister() was never called.
So while we know that it _should_ work, we also know that it was not tested.

> What you do need to determine is if this is a device node you really
> want to be creating in this manner, as it is a new user/kernel API,
> right?
And why, and what for.

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