linux-kernel - Re: [PATCH 0/7] convert semaphore to mutex in struct class

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Message-ID: <20080107172009.GA25943@suse.de>
Date:	Mon, 7 Jan 2008 09:20:09 -0800
From:	Greg KH <gregkh@...e.de>
To:	Stefan Richter <stefanr@...6.in-berlin.de>
Cc:	James.Bottomley@...senpartnership.com,
	dbrownell@...rs.sourceforge.net,
	Dave Young <hidave.darkstar@...il.com>,
	linux-scsi@...r.kernel.org, a.zummo@...ertech.it,
	peterz@...radead.org, cbou@...l.ru, linux-kernel@...r.kernel.org,
	David Brownell <david-b@...bell.net>, krh@...hat.com,
	stern@...land.harvard.edu, rtc-linux@...glegroups.com,
	spi-devel-general@...ts.sourceforge.net,
	linux1394-devel@...ts.sourceforge.net, dwmw2@...radead.org,
	davem@...emloft.net, jarkao2@...il.com
Subject: Re: [PATCH 0/7] convert semaphore to mutex in struct class

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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