linux-kernel - Re: 2.6.21-rc suspend regression: sysfs deadlock

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Message-ID: <Pine.LNX.4.64.0703131418300.9690@woody.linux-foundation.org>
Date:	Tue, 13 Mar 2007 14:20:03 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Cornelia Huck <cornelia.huck@...ibm.com>
cc:	Alan Stern <stern@...land.harvard.edu>,
	Hugh Dickins <hugh@...itas.com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Oliver Neukum <oneukum@...e.de>,
	Maneesh Soni <maneesh@...ibm.com>, gregkh@...e.de,
	Richard Purdie <rpurdie@...ys.net>,
	James Bottomley <James.Bottomley@...elEye.com>,
	Kernel development list <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.21-rc suspend regression: sysfs deadlock



On Tue, 13 Mar 2007, Cornelia Huck wrote:
> 
> Another call that deadlocked with Oliver's patch is ungroup for s390
> ccwgroup devices. It can be made to work again with a similar patch.

Could we please make this easier to use by having some common sysfs helper 
routine for this kind of "delayed_store()" functionality.

I'm not a huge fan of delayed work at all, but if we have to have it, at 
least make it one generic function rather than having multiple functions 
all doing their own workqueue logic for it.

		Linus
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