linux-kernel - RE: [char-misc-next V3] mei: add reference counting for me clients

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Message-ID: <5B8DA87D05A7694D9FA63FD143655C1B1C49677F@HASMSX106.ger.corp.intel.com>
Date:	Thu, 6 Nov 2014 08:40:21 +0000
From:	"Winkler, Tomas" <tomas.winkler@...el.com>
To:	Greg KH <gregkh@...uxfoundation.org>
CC:	"arnd@...db.de" <arnd@...db.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [char-misc-next V3] mei: add reference counting for me clients

> 
> On Tue, Nov 04, 2014 at 05:22:51AM +0000, Winkler, Tomas wrote:
> > >
> > > On Mon, Nov 03, 2014 at 10:42:05AM +0200, Tomas Winkler wrote:
> > > > To support dynamic addition/remove we add reference
> > > > counter.
> > >
> > > What is keeping two different threads / cpus from grabbing a reference
> > > at the same time the other one is dropping it?
> > >
> > > You have a list here, with no locking, right?  You also don't have any
> > > locking for your kref, which isn't good at all...
> > >
> > > Please audit and fix up.
> >
> > Of course there is a lock, it wouldn't work at all. It is not explicit
> > but we run under device_lock mutex.
> 
> Please make it explicit :)

Not sure what you mean by that? There is a lot of options in this laconic  sentence.

Thanks
Tomas


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