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libata: separate out ata_dev_reread_id() 

Separate out ata_dev_reread_id() from ata_dev_revalidate().
ata_dev_reread_id() reads IDENTIFY page and determines whether the
same device is still there.  ata_dev_revalidate() reconfigures after
reread completes.  This will be used by ACPI update.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Tejun Heo 2007-05-15 03:28:15 +09:00 committed by Jeff Garzik
parent d1c68fa6ce
commit fe30911b34
2 changed files with 36 additions and 14 deletions
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47
drivers/ata/libata-core.c
View File

@ -3675,8 +3675,8 @@ static int ata_dev_same_device(struct ata_device *dev, unsigned int new_class,
}
/**
* ata_dev_revalidate - Revalidate ATA device
* @dev: device to revalidate
* ata_dev_reread_id - Re-read IDENTIFY data
* @adev: target ATA device
* @readid_flags: read ID flags
*
* Re-read IDENTIFY page and make sure @dev is still attached to
@ -3688,29 +3688,50 @@ static int ata_dev_same_device(struct ata_device *dev, unsigned int new_class,
* RETURNS:
* 0 on success, negative errno otherwise
*/
int ata_dev_revalidate(struct ata_device *dev, unsigned int readid_flags)
int ata_dev_reread_id(struct ata_device *dev, unsigned int readid_flags)
{
unsigned int class = dev->class;
u16 *id = (void *)dev->ap->sector_buf;
int rc;
if (!ata_dev_enabled(dev)) {
rc = -ENODEV;
goto fail;
}
/* read ID data */
rc = ata_dev_read_id(dev, &class, readid_flags, id);
if (rc)
goto fail;
return rc;
/* is the device still there? */
if (!ata_dev_same_device(dev, class, id)) {
rc = -ENODEV;
goto fail;
}
if (!ata_dev_same_device(dev, class, id))
return -ENODEV;
memcpy(dev->id, id, sizeof(id[0]) * ATA_ID_WORDS);
return 0;
}
/**
* ata_dev_revalidate - Revalidate ATA device
* @dev: device to revalidate
* @readid_flags: read ID flags
*
* Re-read IDENTIFY page, make sure @dev is still attached to the
* port and reconfigure it according to the new IDENTIFY page.
*
* LOCKING:
* Kernel thread context (may sleep)
*
* RETURNS:
* 0 on success, negative errno otherwise
*/
int ata_dev_revalidate(struct ata_device *dev, unsigned int readid_flags)
{
int rc;
if (!ata_dev_enabled(dev))
return -ENODEV;
/* re-read ID */
rc = ata_dev_reread_id(dev, readid_flags);
if (rc)
goto fail;
/* configure device according to the new ID */
rc = ata_dev_configure(dev);

3
drivers/ata/libata.h
View File

@ -76,7 +76,8 @@ extern unsigned ata_exec_internal_sg(struct ata_device *dev,
extern unsigned int ata_do_simple_cmd(struct ata_device *dev, u8 cmd);
extern int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
unsigned int flags, u16 *id);
extern int ata_dev_revalidate(struct ata_device *dev, unsigned int flags);
extern int ata_dev_reread_id(struct ata_device *dev, unsigned int readid_flags);
extern int ata_dev_revalidate(struct ata_device *dev, unsigned int readid_flags);
extern int ata_dev_configure(struct ata_device *dev);
extern int sata_down_spd_limit(struct ata_port *ap);
extern int sata_set_spd_needed(struct ata_port *ap);