[PATCH] libata: Fix HPA handling regression

Restore the support for handling drives that report one sector too many
(ie SCSI not ATA style). This worked before the HPA update but was
removed in that process.

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

2 files changed, 7 insertions, 1 deletions

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index d2880b013c88..eb9709864a21 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -915,7 +915,8 @@ static int ata_read_native_max_address(struct ata_device *dev, u64 *max_sectors)
                 *max_sectors = ata_tf_to_lba48(&tf);
         else
                 *max_sectors = ata_tf_to_lba(&tf);
-
+        if (dev->horkage & ATA_HORKAGE_HPA_SIZE)
+                (*max_sectors)--;
         return 0;
 }
 
@@ -3905,6 +3906,10 @@ static const struct ata_blacklist_entry ata_device_blacklist [] = {
         { "WDC WD2500JD-00HBB0", "WD-WMAL71490727", ATA_HORKAGE_BROKEN_HPA },
         { "MAXTOR 6L080L4",     "A93.0500",     ATA_HORKAGE_BROKEN_HPA },
 
+        /* Devices which report 1 sector over size HPA */
+        { "ST340823A",          NULL,           ATA_HORKAGE_HPA_SIZE, },
+        { "ST320413A",          NULL,           ATA_HORKAGE_HPA_SIZE, },
+
         /* End Marker */
         { }
 };
diff --git a/include/linux/libata.h b/include/linux/libata.h
index cd9c2a28136a..f9ed198e4fcd 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -330,6 +330,7 @@ enum {
         ATA_HORKAGE_MAX_SEC_128 = (1 << 3),     /* Limit max sects to 128 */
         ATA_HORKAGE_BROKEN_HPA  = (1 << 4),     /* Broken HPA */
         ATA_HORKAGE_SKIP_PM     = (1 << 5),     /* Skip PM operations */
+        ATA_HORKAGE_HPA_SIZE    = (1 << 6),     /* native size off by one */
 };
 
 enum hsm_task_states {