From: David Woodhouse <dwmw2@infradead.org>
To: "Marty Leisner" <mleisner@eng.mc.xerox.com>
Cc: linux-kernel@vger.kernel.org, leisner@rochester.rr.com
Subject: Re: kernel threads and close method in a device driver
Date: Wed, 18 Apr 2001 00:32:48 +0100 [thread overview]
Message-ID: <12080.987550368@redhat.com> (raw)
In-Reply-To: <200104172104.RAA08013@mailhost.eng.mc.xerox.com>
In-Reply-To: <200104172104.RAA08013@mailhost.eng.mc.xerox.com>
mleisner@eng.mc.xerox.com said:
> The architecture is currently:
> open device
> do IOCTL (spinning a kernel thread and doing initialization)
> There is currently an IOCTL which short-circuits to the close method.
> Turns out it seems necessary to do this IOCTL -- close never gets
> invoked.
Your kernel thread is probably sharing filedescriptors with the parent
process, so although your application closes its copy, because the kernel
thread hasn't closed its copy, the ->release() method never gets called.
Make sure you're cleaning up properly when starting the kernel thread. See
how other kernel threads do it. As Andi says, daemonize() is a good start,
although it's not always sufficient.
--
dwmw2
next prev parent reply other threads:[~2001-04-17 23:36 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-04-17 21:04 kernel threads and close method in a device driver Marty Leisner
2001-04-17 21:37 ` Alan Cox
2001-04-17 21:43 ` Andi Kleen
2001-04-17 23:32 ` David Woodhouse [this message]
-- strict thread matches above, loose matches on Subject: below --
2001-04-20 18:54 Marty Leisner
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