[PATCH] ide: change master/slave IDENTIFY order Need to probe slave device first to make it release PDIAG- (this is required for correct device side cable detection). Based on libata commit f31f0cc2f0b7527072d94d02da332d9bb8d7d94c. Thanks to Craig for testing this patch. Cc: Craig Block Signed-off-by: Bartlomiej Zolnierkiewicz --- drivers/ide/ide-iops.c | 1 - drivers/ide/ide-probe.c | 7 +++---- 2 files changed, 3 insertions(+), 5 deletions(-) Index: b/drivers/ide/ide-iops.c =================================================================== --- a/drivers/ide/ide-iops.c +++ b/drivers/ide/ide-iops.c @@ -612,7 +612,6 @@ u8 eighty_ninty_three (ide_drive_t *driv /* * FIXME: - * - change master/slave IDENTIFY order * - force bit13 (80c cable present) check also for !ivb devices * (unless the slave device is pre-ATA3) */ Index: b/drivers/ide/ide-probe.c =================================================================== --- a/drivers/ide/ide-probe.c +++ b/drivers/ide/ide-probe.c @@ -719,9 +719,9 @@ EXPORT_SYMBOL_GPL(ide_undecoded_slave); */ static void probe_hwif(ide_hwif_t *hwif, void (*fixup)(ide_hwif_t *hwif)) { - unsigned int unit; unsigned long flags; unsigned int irqd; + int unit; if (hwif->noprobe) return; @@ -777,10 +777,9 @@ static void probe_hwif(ide_hwif_t *hwif, printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name); /* - * Second drive should only exist if first drive was found, - * but a lot of cdrom drives are configured as single slaves. + * Need to probe slave device first to make it release PDIAG-. */ - for (unit = 0; unit < MAX_DRIVES; ++unit) { + for (unit = MAX_DRIVES - 1; unit >= 0; unit--) { ide_drive_t *drive = &hwif->drives[unit]; drive->dn = (hwif->channel ? 2 : 0) + unit; (void) probe_for_drive(drive);