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    Subject[v2.6.34-stable 096/213] Prevent interface errors with Seagate FreeAgent GoFlex
    Date
    From: Daniel J Blueman <daniel@quora.org>

    -------------------
    This is a commit scheduled for the next v2.6.34 longterm release.
    http://git.kernel.org/?p=linux/kernel/git/paulg/longterm-queue-2.6.34.git
    If you see a problem with using this for longterm, please comment.
    -------------------

    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@quora.org>
    Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
    Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
    ---
    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 6e4b795d79e0..ce0ba625bd62 100644
    --- a/drivers/ata/libata-core.c
    +++ b/drivers/ata/libata-core.c
    @@ -4407,6 +4407,7 @@ 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
    --
    1.8.5.2


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