Date: Mon, 7 Jan 2008 09:20:09 -0800
From: Greg KH <gregkh@suse.de>
To: Stefan Richter <stefanr@s5r6.in-berlin.de>
Cc: James.Bottomley@hansenpartnership.com, dbrownell@users.sourceforge.net,
       Dave Young <hidave.darkstar@gmail.com>, linux-scsi@vger.kernel.org,
       a.zummo@towertech.it, peterz@infradead.org, cbou@mail.ru,
       linux-kernel@vger.kernel.org, David Brownell <david-b@pacbell.net>,
       krh@redhat.com, stern@rowland.harvard.edu, rtc-linux@googlegroups.com,
       spi-devel-general@lists.sourceforge.net,
       linux1394-devel@lists.sourceforge.net, dwmw2@infradead.org,
       davem@davemloft.net, jarkao2@gmail.com
Subject: Re: [PATCH 0/7] convert semaphore to mutex in struct class
Message-ID: <20080107172009.GA25943@suse.de>
References: <20080103055019.GA4885@darkstar.te-china.tietoenator.com> <20080107020944.GA3637@darkstar.te-china.tietoenator.com> <20080107084528.GA8365@suse.de> <200801070101.15168.david-b@pacbell.net> <478227D5.8050402@s5r6.in-berlin.de> <20080107154404.GA10880@suse.de> <47825DC1.3090102@s5r6.in-berlin.de>
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On Mon, Jan 07, 2008 at 06:13:37PM +0100, Stefan Richter wrote:
> It's already in the driver core to the most part.  It remains to be seen
> what is less complicated in the end:  Transparent mutex-protected list
> accesses provided by driver core (requires the iterator), or all the
> necessary locking done by the drivers themselves (requires some more
> lock-taking but perhaps fewer lock instances overall in the drivers, and
> respective redefinitions and documentation of the driver core API).

I favor changing the driver core api and doing this kind of thing there.
It keeps the drivers simpler and should hopefully make their lives
easier.

> Semi off-topic:  What about struct device.sem?  Is there any chance to
> rip this out of the driver core and let drivers serialize everything?  I
> suppose not...

See the previous long threads about this very topic, that is what caused
this class.sem patches :)

thanks,

greg k-h
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