linux-kernel - new regression in 2.6.25-rc3: can't resume from suspend to ram, ata1 errors

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Date:	Mon, 25 Feb 2008 22:57:24 +0200
From:	"Michael S. Tsirkin" <m.s.tsirkin@...il.com>
To:	"Andrew Morton" <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>, "Pavel Machek" <pavel@...e.cz>,
	"Jeff Garzik" <jeff@...zik.org>, jgarzik@...ox.com,
	linux-ide@...r.kernel.org
Subject: new regression in 2.6.25-rc3: can't resume from suspend to ram, ata1 errors

On my T61p, 2.6.25-rc2 seems to wake up fine from suspend to ram.
Not so 2.6.25-rc3: it hangs on suspend to ram, with a blank screen.

At one point I got lucky and got this on console (wrote down by hand,
there could be typos):
ata1: COMRESET failed (errno=-16)
ata1: COMRESET failed (errno=-16)
end_request: I/O error, dev sda sector 200554
Buffer I/O error on device dm-0, logical block 256
Buffer I/O error on device dm-0, logical block 15695875
Buffer I/O error on device dm-0, logical block 15695878
Buffer I/O error on device dm-0, logical block 15695887
Buffer I/O error on device dm-0, logical block 15695896
Buffer I/O error on device dm-0, logical block 15695914
Buffer I/O error on device dm-0, logical block 15958028
Buffer I/O error on device dm-0, logical block 22118530
Buffer I/O error on device dm-0, logical block 22315068
Buffer I/O error on device dm-0, logical block 22347824

git bisect points at this commit:
commit 559bbe6cbd0d8c68d40076a5f7dc98e3bf5864b2.
power_state: get rid of write-only variable in SATA

After reverting 559bbe6cbd0d8c68d40076a5f7dc98e3bf5864b2
on top of 2.6.25-rc3 the kernel again resumes from suspend to ram.
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