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[PATCH] libata: modify ata_dev_try_classify 

Make ata_dev_try_classify take @r_err to store tf error register value
on completion and return device class instead of directly manipulating
dev->class.  This is preparation for new reset mechanism.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
This commit is contained in:
Tejun Heo 2006-01-24 17:05:22 +09:00 committed by Jeff Garzik
parent 6f8b995895
commit b4dc7623c1
1 changed files with 16 additions and 14 deletions
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30
drivers/scsi/libata-core.c
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@ -830,6 +830,7 @@ unsigned int ata_dev_classify(const struct ata_taskfile *tf)
* ata_dev_try_classify - Parse returned ATA device signature
* @ap: ATA channel to examine
* @device: Device to examine (starting at zero)
* @r_err: Value of error register on completion
*
* After an event -- SRST, E.D.D., or SATA COMRESET -- occurs,
* an ATA/ATAPI-defined set of values is placed in the ATA
@ -842,11 +843,14 @@ unsigned int ata_dev_classify(const struct ata_taskfile *tf)
*
* LOCKING:
* caller.
*
* RETURNS:
* Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
*/
static u8 ata_dev_try_classify(struct ata_port *ap, unsigned int device)
static unsigned int
ata_dev_try_classify(struct ata_port *ap, unsigned int device, u8 *r_err)
{
struct ata_device *dev = &ap->device[device];
struct ata_taskfile tf;
unsigned int class;
u8 err;
@ -857,8 +861,8 @@ static u8 ata_dev_try_classify(struct ata_port *ap, unsigned int device)
ap->ops->tf_read(ap, &tf);
err = tf.feature;
dev->class = ATA_DEV_NONE;
if (r_err)
*r_err = err;
/* see if device passed diags */
if (err == 1)
@ -866,18 +870,16 @@ static u8 ata_dev_try_classify(struct ata_port *ap, unsigned int device)
else if ((device == 0) && (err == 0x81))
/* do nothing */ ;
else
return err;
return ATA_DEV_NONE;
/* determine if device if ATA or ATAPI */
/* determine if device is ATA or ATAPI */
class = ata_dev_classify(&tf);
if (class == ATA_DEV_UNKNOWN)
return err;
return ATA_DEV_NONE;
if ((class == ATA_DEV_ATA) && (ata_chk_status(ap) == 0))
return err;
dev->class = class;
return err;
return ATA_DEV_NONE;
return class;
}
/**
@ -2177,9 +2179,9 @@ void ata_bus_reset(struct ata_port *ap)
/*
* determine by signature whether we have ATA or ATAPI devices
*/
err = ata_dev_try_classify(ap, 0);
ap->device[0].class = ata_dev_try_classify(ap, 0, &err);
if ((slave_possible) && (err != 0x81))
ata_dev_try_classify(ap, 1);
ap->device[1].class = ata_dev_try_classify(ap, 1, &err);
/* re-enable interrupts */
if (ap->ioaddr.ctl_addr) /* FIXME: hack. create a hook instead */