libata: Prevent interface errors with Seagate FreeAgent GoFlex

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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 000d03ae6653d7ad294d7477ab84d254d7e2f012..600ede0c0720d223785e25b2f9690443fe0e2490 100644 (file)
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -4138,6 +4138,7 @@ 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