[libata] pata_efar: add locking for parallel scanning
authorBartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Wed, 17 Feb 2010 13:16:58 +0000 (13:16 +0000)
committerJeff Garzik <jgarzik@redhat.com>
Mon, 1 Mar 2010 20:04:58 +0000 (15:04 -0500)
commit303f1a76ae792885af8a4a0e784e22e31e850e9a
treed390d5ca09c5fc0ddb8ac3c1d09361c1bfa3a1f5
parent16ea0fc98d53c72cb4e1a9edcb685a87e3a81430
[libata] pata_efar: add locking for parallel scanning

Add clearing of UDMA enable bit also for PIO modes and then add
extra locking for parallel scanning.

This is similar change as commit 60c3be3 for ata_piix host driver
and while pata_efar doesn't enable parallel scan yet the race could
probably also be triggered by requesting re-scanning of both ports
at the same time using SCSI sysfs interface.

[Ported to current kernel without other patch dependancies by
 Alan Cox]

Original is
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

This one is
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
drivers/ata/pata_efar.c