linux-kernel - Re: [PATCH RFD] alternative kobject release wait mechanism

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Sun, 22 Apr 2007 23:53:09 -0700
From:	Greg KH <greg@...ah.com>
To:	Tejun Heo <htejun@...il.com>
Cc:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Cornelia Huck <cornelia.huck@...ibm.com>,
	Alan Stern <stern@...land.harvard.edu>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Rusty Russell <rusty@...tcorp.com.au>
Subject: Re: [PATCH RFD] alternative kobject release wait mechanism

On Mon, Apr 23, 2007 at 03:40:21PM +0900, Tejun Heo wrote:
> Hello, Dmitry.
> 
> Dmitry Torokhov wrote:
> > Isn't think a good thing? By decoupling the 2 layers we insulate them
> > from changes in each other. This allows bug subsystems to concentrate
> > on topics that important to them instead of worying about refcounting
> > objects that are not directly interesting for the subsystem in
> > question.
> 
> I think the best thing would be make struct device's lifetime rules
> simple enough such that it doesn't really matter to driver subsystems
> and drivers can just do what they wanna do.

I agree.

> Also, separate struct device from the actual implementation has problem
> in that struct device is widely used to refer to the device by many
> layers drivers register devices to.  Basically, you'll have to implement
> immediate-disconnect between struct device and the actual
> implementation.  So, it just shifts the problem from struct device to
> the place between struct device and actual implementation and I think
> struct device itself is better place to deal with that than somewhere
> inbetween it and driver private data.

I also agree.

> > Now for smaller subsystems it may make sense to embed stuct devices
> > into subsystem objects and manage it all together. In fact input
> > system does this but I think it is much simlpier than SCSI or IDE.
> 
> Well, both SCSI and IDE heavily depend on struct device acting as 'base
> class'.  It's all over the place and almost a basic assumption about the
> driver model.

And that's how it should be.

And your sysfs patches now make it a lot easier than before, and I can't
thank you enough for doing that work.

thanks,

greg k-h
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/