From: Jonathan Corbet <corbet@lwn.net>
To: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Cc: linux-kernel@vger.kernel.org, Greg KH <greg@kroah.com>
Subject: Re: [PATCH/RFC] core: add a function to safely try to get device driver owner
Date: Mon, 29 Nov 2010 13:17:37 -0700 [thread overview]
Message-ID: <20101129131737.3dd6eb03@bike.lwn.net> (raw)
In-Reply-To: <Pine.LNX.4.64.1011292043000.27962@axis700.grange>
On Mon, 29 Nov 2010 20:43:28 +0100 (CET)
Guennadi Liakhovetski <g.liakhovetski@gmx.de> wrote:
> When two drivers interoperate without an explicit dependency, it is often
> required to prevent one of them from being unloaded safely by dereferencing
> dev->driver->owner. This patch provides a generic function to do this in a
> race-free way.
I must ask: why not, instead, make the dependency explicit? In
particular, this looks like an application for the proposed media
controller code, which is meant to model the connections between otherwise
independent devices. The fact that your example comes from V4L2 (which is
the current domain of the media controller) also argues that way.
jon
next prev parent reply other threads:[~2010-11-29 20:17 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-11-29 19:43 Guennadi Liakhovetski
2010-11-29 19:56 ` Greg KH
2010-11-29 20:11 ` Guennadi Liakhovetski
2010-11-29 20:17 ` Jonathan Corbet [this message]
2010-11-29 20:54 ` Guennadi Liakhovetski
2010-11-29 21:41 ` Greg KH
2010-11-29 22:10 ` Guennadi Liakhovetski
2010-11-29 22:28 ` Jonathan Corbet
2010-11-30 7:18 ` Guennadi Liakhovetski
2010-11-29 22:32 ` Greg KH
2010-11-29 23:11 ` Guennadi Liakhovetski
2010-11-30 16:56 ` Greg KH
2010-11-30 17:09 ` Guennadi Liakhovetski
2010-11-30 17:15 ` Greg KH
2010-11-30 17:55 ` Laurent Pinchart
2010-11-30 18:32 ` Greg KH
2010-11-30 20:43 ` Laurent Pinchart
2010-11-30 20:55 ` Greg KH
2010-11-30 22:19 ` Hans Verkuil
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20101129131737.3dd6eb03@bike.lwn.net \
--to=corbet@lwn.net \
--cc=g.liakhovetski@gmx.de \
--cc=greg@kroah.com \
--cc=linux-kernel@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
all inboxes | Powered by JetHome®