From: Evan Lavelle <sa212+lkml@cyconix.com>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: LKML <linux-kernel@vger.kernel.org>
Subject: Re: Kernel deferring driver 'close' call: workaround?
Date: Wed, 26 Jan 2011 15:29:47 +0000 [thread overview]
Message-ID: <4D403DEB.8040208@cyconix.com> (raw)
In-Reply-To: <20110126143851.711c57df@lxorguk.ukuu.org.uk>
On 26/01/2011 14:38, Alan Cox wrote:
> On Wed, 26 Jan 2011 14:29:50 +0000
> Evan Lavelle<sa212+lkml@cyconix.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
Excellent! Fixed - well done.
-Evan
prev parent reply other threads:[~2011-01-26 15:30 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-01-26 12:48 Kernel deferring driver 'close' call: workaround? Evan Lavelle
2011-01-26 13:17 ` Alan Cox
2011-01-26 14:29 ` Evan Lavelle
2011-01-26 14:38 ` Alan Cox
2011-01-26 15:29 ` Evan Lavelle [this message]
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