linux-kernel - Re: 2.6.23-mm1

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Date:	Sat, 13 Oct 2007 14:03:28 +0200
From:	"Torsten Kaiser" <just.for.lkml@...glemail.com>
To:	"Jeff Garzik" <jeff@...zik.org>
Cc:	"Andrew Morton" <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org,
	"Kuan Luo" <kluo@...dia.com>, "Peer Chen" <pchen@...dia.com>
Subject: Re: 2.6.23-mm1

On 10/13/07, Jeff Garzik <jeff@...zik.org> wrote:
> Torsten Kaiser wrote:
> > On 10/12/07, Andrew Morton <akpm@...ux-foundation.org> wrote:
> >> On Fri, 12 Oct 2007 10:31:42 +0200 "Torsten Kaiser" <just.for.lkml@...glemail.com> wrote:
> >>> Oct 12 10:23:03 treogen smartd[6091]: Device: /dev/sdc, not found in
> >>> smartd database.
> >> hm.
> >>
> >>> Oct 12 10:23:03 treogen [  105.990000] WARNING: at
> >>> drivers/ata/libata-core.c:5752 ata_qc_issue()
> >> Let's cc linux-ide.
> >>
> >>> Oct 12 10:23:03 treogen [  105.990000]
> >>> Oct 12 10:23:03 treogen [  105.990000] Call Trace:
> >>> Oct 12 10:23:03 treogen [  105.990000]  [<ffffffff804442ef>]
> >>> ata_qc_issue+0x47f/0x540
> >>> Oct 12 10:23:03 treogen [  105.990000]  [<ffffffff80432e60>] scsi_done+0x0/0x20
> >>> Oct 12 10:23:03 treogen [  105.990000]  [<ffffffff80449c80>]
> >>> ata_scsi_flush_xlat+0x0/0x30
>
> > Oct 13 07:46:48 treogen [   99.850000]
> > Oct 13 07:46:48 treogen [   99.850000] ata3: EH in SWNCQ
> > mode,QC:qc_active 0x3 sactive 0x1
> > Oct 13 07:46:48 treogen [   99.850000] ata3: SWNCQ:qc_active 0x1
> > defer_bits 0x0 last_issue_tag 0x0
>
> The WARNING indicates that there is a SWNCQ bug in sata_nv.  Given that
> the problem appears when SYNCHRONIZE CACHE is being issued, I would

I can't follow you on SYNCHRONIZE CACHE.
The only command written to the syslog in the errors where
0x60==ATA_CMD_FPDMA_READ and 0xB0 (which is not in
include/linux/ata.h, but ATA-6 says that this is SMART related. That
makes sense, as smartd is failing).

> guess that sata_nv is not properly handling non-queued commands.

But that still seems correct, as I would not expect that SMART
commands get queued. (Thats just a guess, as I did not try to find the
code that does this distinction)

> This is a patch from libata-dev.git#nv-swncq (via #ALL).

Comparing sata_nv.c from 2.6.23-rc8-mm1 and 2.6.23-mm1 I see two
changes, that look suspicious:

http://git.kernel.org/?p=linux/kernel/git/jgarzik/libata-dev.git;a=commitdiff;h=31cc23b34913bc173680bdc87af79e551bf8cc0d

The comment says: "ahci and sata_sil24 are converted to use ata_std_qc_defer()."
But the patch also adds ".qc_defer = ata_std_qc_defer," to sata_nv.c

The second change is the removal of the 'lock' spinlock from sata_nv.c
that was used in nv_swncq_qc_issue and nv_swncq_host_interrupt.

Should I try to revert one or both of these changes?

Torsten
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