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SubjectRe: 2.6.27-rc1 (2fca5c): libata: kernel cant boot
On Fri, Oct 24 2008, Elias Oltmanns wrote:
> Jens Axboe <jens.axboe@oracle.com> wrote:
> > From e598055dde1951c47c8b3522616f6ebff0ed9847 Mon Sep 17 00:00:00 2001
> > From: Jens Axboe <jens.axboe@oracle.com>
> > Date: Fri, 24 Oct 2008 09:22:42 +0200
> > Subject: [PATCH] libata: fix bug with non-ncq devices
> >
> > The recent commit 201f1b98822078c808b5e2d379a6ddbfc0a06ee1 to enable
>
> Wouldn't that be commit 2fca5ccf97d2c28bcfce44f5b07d85e74e3cd18e?

Yes that is correct, the other commit is actually a private one in my
tree for other libata changes. Updated patch below, thanks for checking!

From e598055dde1951c47c8b3522616f6ebff0ed9847 Mon Sep 17 00:00:00 2001
From: Jens Axboe <jens.axboe@oracle.com>
Date: Fri, 24 Oct 2008 09:22:42 +0200
Subject: [PATCH] libata: fix bug with non-ncq devices

The recent commit 2fca5ccf97d2c28bcfce44f5b07d85e74e3cd18e to enable
support for block layer tagging in libata was broken for non-NCQ
devices. The block layer initializes the tag field to -1 to detect
invalid uses of a tag, and if the libata devices does NOT support
NCQ, we just used that field to index the internal command list.
So we need to check for -1 first and only use the tag field if
it's valid.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
---
drivers/ata/libata-scsi.c | 6 +++++-
1 files changed, 5 insertions(+), 1 deletions(-)
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index d5b9b72..4b95c43 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -708,7 +708,11 @@ static struct ata_queued_cmd *ata_scsi_qc_new(struct ata_device *dev,
{
struct ata_queued_cmd *qc;

- qc = ata_qc_new_init(dev, cmd->request->tag);
+ if (cmd->request->tag != -1)
+ qc = ata_qc_new_init(dev, cmd->request->tag);
+ else
+ qc = ata_qc_new_init(dev, 0);
+
if (qc) {
qc->scsicmd = cmd;
qc->scsidone = done;
--
1.6.0.2.588.g3102

--
Jens Axboe



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