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[PATCH] libata-hp: implement ata_eh_detach_dev()

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Implement ata_eh_detach_dev().  This function is responsible for
detaching an ATA device and offlining the associated SCSI device
atomically so that the detached device is not accessed after ATA
detach is complete.

Signed-off-by: Tejun Heo <htejun@gmail.com>
This commit is contained in:
Tejun Heo 2006-05-31 18:28:01 +09:00
parent e8e008e7b5
commit 0ea035a3d1
3 changed files with 53 additions and 0 deletions
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28
drivers/scsi/libata-eh.c
View File

@ -666,6 +666,34 @@ void ata_eh_qc_retry(struct ata_queued_cmd *qc)
__ata_eh_qc_complete(qc);
}
/**
* ata_eh_detach_dev - detach ATA device
* @dev: ATA device to detach
*
* Detach @dev.
*
* LOCKING:
* None.
*/
static void ata_eh_detach_dev(struct ata_device *dev)
{
struct ata_port *ap = dev->ap;
unsigned long flags;
ata_dev_disable(dev);
spin_lock_irqsave(&ap->host_set->lock, flags);
dev->flags &= ~ATA_DFLAG_DETACH;
if (ata_scsi_offline_dev(dev)) {
dev->flags |= ATA_DFLAG_DETACHED;
ap->flags |= ATA_FLAG_SCSI_HOTPLUG;
}
spin_unlock_irqrestore(&ap->host_set->lock, flags);
}
/**
* ata_eh_about_to_do - about to perform eh_action
* @ap: target ATA port

24
drivers/scsi/libata-scsi.c
View File

@ -2762,3 +2762,27 @@ void ata_scsi_scan_host(struct ata_port *ap)
}
}
}
/**
* ata_scsi_offline_dev - offline attached SCSI device
* @dev: ATA device to offline attached SCSI device for
*
* This function is called from ata_eh_hotplug() and responsible
* for taking the SCSI device attached to @dev offline. This
* function is called with host_set lock which protects dev->sdev
* against clearing.
*
* LOCKING:
* spin_lock_irqsave(host_set lock)
*
* RETURNS:
* 1 if attached SCSI device exists, 0 otherwise.
*/
int ata_scsi_offline_dev(struct ata_device *dev)
{
if (dev->sdev) {
scsi_device_set_state(dev->sdev, SDEV_OFFLINE);
return 1;
}
return 0;
}

1
drivers/scsi/libata.h
View File

@ -75,6 +75,7 @@ extern int ata_cmd_ioctl(struct scsi_device *scsidev, void __user *arg);
extern struct scsi_transport_template ata_scsi_transport_template;
extern void ata_scsi_scan_host(struct ata_port *ap);
extern int ata_scsi_offline_dev(struct ata_device *dev);
extern unsigned int ata_scsiop_inq_std(struct ata_scsi_args *args, u8 *rbuf,
unsigned int buflen);