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Re: 2.6.22-rc3 hibernate(?) fails totally - regression (xfs on raid6)

To: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Subject: Re: 2.6.22-rc3 hibernate(?) fails totally - regression (xfs on raid6)
From: Jeff Garzik <jgarzik@xxxxxxxxx>
Date: Wed, 13 Jun 2007 17:22:55 -0400
Cc: David Greaves <david@xxxxxxxxxxxx>, David Chinner <dgc@xxxxxxx>, Tejun Heo <htejun@xxxxxxxxx>, "Rafael J. Wysocki" <rjw@xxxxxxx>, xfs@xxxxxxxxxxx, "'linux-kernel@xxxxxxxxxxxxxxx'" <linux-kernel@xxxxxxxxxxxxxxx>, linux-pm <linux-pm@xxxxxxxxxxxxxx>, Neil Brown <neilb@xxxxxxx>
In-reply-to: <alpine.LFD.0.98.0706131344550.14121@woody.linux-foundation.org>
References: <200706020122.49989.rjw@sisk.pl> <4661EFBB.5010406@dgreaves.com> <alpine.LFD.0.98.0706021538360.23741@woody.linux-foundation.org> <4662D852.4000005@dgreaves.com> <46667160.80905@gmail.com> <46668EE0.2030509@dgreaves.com> <46679D56.7040001@gmail.com> <4667DE2D.6050903@dgreaves.com> <20070607110708.GS86004887@sgi.com> <46680F5E.6070806@dgreaves.com> <20070607222813.GG85884050@sgi.com> <4669A965.20403@dgreaves.com> <alpine.LFD.0.98.0706121123550.14121@woody.linux-foundation.org> <466FD214.9070603@dgreaves.com> <alpine.LFD.0.98.0706131344550.14121@woody.linux-foundation.org>
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Linus Torvalds wrote:
Ok, good. So the bug is apparently in the generic SCSI layer start/stop
handling. I'm not entirely surprised, most people would never have triggered it (I _think_ it's disabled by default for all devices, and that the libata-scsi.c change was literally the first thing to ever enable it by default for anything!)

I haven't looked at this yet, but wanted to confirm your assessment here: libata was indeed the first (and still only?) user of this code path.

Since some SCSI devices may not be owned by the host computer, in the power management sense, we don't want to turn that on for all SCSI devices. Otherwise you wind up powering off a device in another building :)

This is basically the libata suspend/resume path, even though bits touch generic SCSI.


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