ide-disk: set_addressing() fixes

* Return -EIO if arg > 0 and LBA48 is unsupported.

* No need to reset ->addressing.

* Make ->addressing a single bit flag.
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

drivers/ide/ide-disk.c

@@ -686,14 +686,13 @@ static int set_addressing(ide_drive_t *drive, int arg)
 	if (arg < 0 || arg > 2)
 		return -EINVAL;
 
-	drive->addressing =  0;
-
-	if (drive->hwif->host_flags & IDE_HFLAG_NO_LBA48)
-		return 0;
-
-	if (ata_id_lba48_enabled(drive->id) == 0)
+	if (arg && ((drive->hwif->host_flags & IDE_HFLAG_NO_LBA48) ||
+	    ata_id_lba48_enabled(drive->id) == 0))
 		return -EIO;
 
+	if (arg == 2)
+		arg = 0;
+
 	drive->addressing = arg;
 
 	return 0;

include/linux/ide.h

@@ -509,7 +509,7 @@ struct ide_drive_s {
 	unsigned sleeping	: 1;	/* 1=sleeping & sleep field valid */
 	unsigned post_reset	: 1;
 	unsigned udma33_warned	: 1;
-	unsigned addressing	: 2;	/* 0=28-bit, 1=48-bit, 2=48-bit doing 28-bit */
+	unsigned addressing	: 1;	/* 0=28-bit, 1=48-bit */
 	unsigned wcache		: 1;	/* status of write cache */
 	unsigned nowerr		: 1;	/* used for ignoring ATA_DF */