linux-kernel - [ 057/108] [libata] Prevent interface errors with Seagate FreeAgent GoFlex

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Date:	Sun, 07 Oct 2012 23:59:31 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Daniel J Blueman <daniel@...ra.org>,
	Jeff Garzik <jgarzik@...hat.com>
Subject: [ 057/108] [libata] Prevent interface errors with Seagate FreeAgent GoFlex

3.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Daniel J Blueman <daniel@...ra.org>

commit c531077f40abc9f2129c4c83a30b3f8d6ce1c0e7 upstream.

When using my Seagate FreeAgent GoFlex eSATAp external disk enclosure,
interface errors are always seen until 1.5Gbps is negotiated [1]. This
occurs using any disk in the enclosure, and when the disk is connected
directly with a generic passive eSATAp cable, we see stable 3Gbps
operation as expected.

Blacklist 3Gbps mode to avoid dataloss and the ~30s delay bus reset
and renegotiation incurs.

Signed-off-by: Daniel J Blueman <daniel@...ra.org>
Signed-off-by: Jeff Garzik <jgarzik@...hat.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/ata/libata-core.c |    1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index c14f88c..95a656f 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -4129,6 +4129,7 @@ static const struct ata_blacklist_entry ata_device_blacklist [] = {
 
 	/* Devices which aren't very happy with higher link speeds */
 	{ "WD My Book",			NULL,	ATA_HORKAGE_1_5_GBPS, },
+	{ "Seagate FreeAgent GoFlex",	NULL,	ATA_HORKAGE_1_5_GBPS, },
 
 	/*
 	 * Devices which choke on SETXFER.  Applies only if both the


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