linux-kernel - Re: Kernel deferring driver 'close' call: workaround?

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Message-ID: <20110126143851.711c57df@lxorguk.ukuu.org.uk>
Date:	Wed, 26 Jan 2011 14:38:51 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Evan Lavelle <sa212+lkml@...onix.com>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: Kernel deferring driver 'close' call: workaround?

On Wed, 26 Jan 2011 14:29:50 +0000
Evan Lavelle <sa212+lkml@...onix.com> wrote:

> On 26/01/2011 13:17, Alan Cox wrote:
> 
> > I imagine the user has a bug in their app. The close method is called on
> > the final close of the handle. That means if for example you do something
> > like fork off a child process and forget to close the handle then it
> > won't actually close down until the final user closes it.
> 
> That was my first reaction, but the strace output only shows an open and 
> close of two shared libs, open and close for this board, some mmaps from 
> the driver, and the basic brk/fstat/etc stuff. Unfortunately, I haven't 
> got the app source, or even the board... :(

An mmap reference counts as an open .... it won't be released until the
mmaps are gone
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