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[PATCH] libata: add ata_dev_pair helper

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Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Alan Cox 2006-03-23 15:38:34 +00:00 • committed by Jeff Garzik
commit ebdfca6eb1
2 changed files with 19 additions and 0 deletions
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17
drivers/scsi/libata-core.c
View file

@ -1575,6 +1575,23 @@ void sata_phy_reset(struct ata_port *ap)
ata_bus_reset(ap); ata_bus_reset(ap);
} }
/**
* ata_dev_pair - return other device on cable
* @ap: port
* @adev: device
*
* Obtain the other device on the same cable, or if none is
* present NULL is returned
*/
struct ata_device *ata_dev_pair(struct ata_port *ap, struct ata_device *adev)
{
struct ata_device *pair = &ap->device[1 - adev->devno];
if (!ata_dev_present(pair))
return NULL;
return pair;
}
/** /**
* ata_port_disable - Disable port. * ata_port_disable - Disable port.
* @ap: Port to be disabled. * @ap: Port to be disabled.

2
include/linux/libata.h
View file

@ -573,6 +573,8 @@ extern int ata_std_bios_param(struct scsi_device *sdev,
struct block_device *bdev, struct block_device *bdev,
sector_t capacity, int geom[]); sector_t capacity, int geom[]);
extern int ata_scsi_slave_config(struct scsi_device *sdev); extern int ata_scsi_slave_config(struct scsi_device *sdev);
extern struct ata_device *ata_dev_pair(struct ata_port *ap,
struct ata_device *adev);
/* /*
* Timing helpers * Timing helpers