Re: [RFC/PATCH 0/22] W1: sysfs, lifetime and other fixes

From: Greg KH
Date: Tue Apr 26 2005 - 02:07:09 EST

On Tue, Apr 26, 2005 at 10:43:36AM +0400, Evgeniy Polyakov wrote:
> On Mon, 2005-04-25 at 15:22 -0500, Dmitry Torokhov wrote:
> > On 4/25/05, Evgeniy Polyakov <johnpol@xxxxxxxxxxx> wrote:
> > > While thinking about locking schema
> > > with respect to sysfs files I recalled,
> > > why I implemented such a logic -
> > > now one can _always_ remove _any_ module
> > > [corresponding object is removed from accessible
> > > pathes and waits untill all exsting users are gone],
> > > which is very good - I really like it in networking model,
> > > while with whole device driver model
> > > if we will read device's file very quickly
> > > in several threads we may end up not unloading it at all.
> >
> > I am sorrry, that is complete bull*. sysfs also allows removing
> > modules at an arbitrary time (and usually without annoying "waiting
> > for refcount" at that)... You just seem to not understand how driver
> > code works, thus the need of inventing your own schema.
> Ok, let's try again - now with explanation,
> since it looks like you did not even try to understand what I said.
> If you will remove objects from ->remove() callback
> you may end up with rmmod being stuck.

Yes, and that is acceptable. networking implemented their own locking
method to allow unloading of their drivers in such a manner. No other
subsystem is going to do that kind of implementation, so Dmitry is
correct here.


greg k-h
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