[LIBATA] Blacklist certain Maxtor firmware revisions for FUA support

It looks like they are either discarding or corrupting data when the FUA
command is used, bad.
Signed-off-by: Jens Axboe <axboe@suse.de>

drivers/scsi/libata-scsi.c

@@ -1700,6 +1700,31 @@ static unsigned int ata_msense_rw_recovery(u8 **ptr_io, const u8 *last)
 	return sizeof(def_rw_recovery_mpage);
 }
 
+/*
+ * We can turn this into a real blacklist if it's needed, for now just
+ * blacklist any Maxtor BANC1G10 revision firmware
+ */
+static int ata_dev_supports_fua(u16 *id)
+{
+	unsigned char model[41], fw[9];
+
+	if (!ata_id_has_fua(id))
+		return 0;
+
+	model[40] = '\0';
+	fw[8] = '\0';
+
+	ata_dev_id_string(id, model, ATA_ID_PROD_OFS, sizeof(model) - 1);
+	ata_dev_id_string(id, fw, ATA_ID_FW_REV_OFS, sizeof(fw) - 1);
+
+	if (strncmp(model, "Maxtor", 6))
+		return 1;
+	if (strncmp(fw, "BANC1G10", 8))
+		return 1;
+
+	return 0; /* blacklisted */
+}
+
 /**
  *	ata_scsiop_mode_sense - Simulate MODE SENSE 6, 10 commands
  *	@args: device IDENTIFY data / SCSI command of interest.
@@ -1797,7 +1822,7 @@ unsigned int ata_scsiop_mode_sense(struct ata_scsi_args *args, u8 *rbuf,
 		return 0;
 
 	dpofua = 0;
-	if (ata_id_has_fua(args->id) && dev->flags & ATA_DFLAG_LBA48 &&
+	if (ata_dev_supports_fua(args->id) && dev->flags & ATA_DFLAG_LBA48 &&
 	    (!(dev->flags & ATA_DFLAG_PIO) || dev->multi_count))
 		dpofua = 1 << 4;