linux-kernel - Re: [PATCH 01/12] Use mutex instead of semaphore in driver core

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Date:	Thu, 3 Jan 2008 09:00:58 +0800
From:	"Dave Young" <hidave.darkstar@...il.com>
To:	"Alan Stern" <stern@...land.harvard.edu>
Cc:	"Greg KH" <gregkh@...e.de>, "David Miller" <davem@...emloft.net>,
	"Greg KH" <greg@...ah.com>, peterz@...radead.org,
	"Kernel development list" <linux-kernel@...r.kernel.org>,
	"USB list" <linux-usb@...r.kernel.org>
Subject: Re: [PATCH 01/12] Use mutex instead of semaphore in driver core

On Jan 3, 2008 12:08 AM, Alan Stern <stern@...land.harvard.edu> wrote:
> On Tue, 1 Jan 2008, Greg KH wrote:
>
> > For most cases, yes, I agree with this, but due to the lockdep issues
> > that occur here, and the whole mess with the suspend path and locking
> > the device tree, that has been hashed out many times in the past, I am
> > interested in trying to see if there is any real reason why this is
> > absolutely necessary to convert.
> >
> > If no one has noticed any issues in this area, I think the complexity
> > that will be involved in any such conversion will strongly outweigh any
> > simplicity that might be expected.
> >
> > I'm very open to potential patches to do this, just don't ignore the
> > issues that others have run into in the past when attempting this.
>
> There are two separate things to consider here.  One is struct device
> and the other is struct class.
>
> We know that replacing semaphores with mutexes in struct device doesn't
> sit well with lockdep.  However the replacement may work perfectly
> smoothly for struct class.  It would be worthwhile for Dave Young to
> separate out just that part and try it.
>
Ok, let me try a new patch only for struct class.

Regards
dave
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