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libata: assume no device is attached if both IDENTIFYs are aborted 

This is to fix bugzilla #10254.  QSI cdrom attached to pata_sis as
secondary master appears as phantom device for the slave.
Interestingly, instead of not setting DRQ after IDENTIFY which
triggers NODEV_HINT, it aborts both IDENTIFY and IDENTIFY PACKET which
makes EH retry.

Modify EH such that it assumes no device is attached if both flavors
of IDENTIFY are aborted by the device.  There really isn't much point
in retrying when the device actively aborts the commands.

While at it, convert NODEV detection message to ata_dev_printk() to
help debugging obscure detection problems.

This problem was reported by Jan Bücken.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Cc: Jan Bücken <jb.faq@gmx.de>
Acked-by: Alan Cox <alan@redhat.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Tejun Heo 2008-03-23 15:16:53 +09:00 committed by Jeff Garzik
parent b63b133165
commit 1ffc151fcd
1 changed files with 24 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

38
drivers/ata/libata-core.c
View File

@ -2092,24 +2092,34 @@ int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
id, sizeof(id[0]) * ATA_ID_WORDS, 0);
if (err_mask) {
if (err_mask & AC_ERR_NODEV_HINT) {
DPRINTK("ata%u.%d: NODEV after polling detection\n",
ap->print_id, dev->devno);
ata_dev_printk(dev, KERN_DEBUG,
"NODEV after polling detection\n");
return -ENOENT;
}
/* Device or controller might have reported the wrong
* device class. Give a shot at the other IDENTIFY if
* the current one is aborted by the device.
*/
if (may_fallback &&
(err_mask == AC_ERR_DEV) && (tf.feature & ATA_ABORTED)) {
may_fallback = 0;
if ((err_mask == AC_ERR_DEV) && (tf.feature & ATA_ABORTED)) {
/* Device or controller might have reported
* the wrong device class. Give a shot at the
* other IDENTIFY if the current one is
* aborted by the device.
*/
if (may_fallback) {
may_fallback = 0;
if (class == ATA_DEV_ATA)
class = ATA_DEV_ATAPI;
else
class = ATA_DEV_ATA;
goto retry;
if (class == ATA_DEV_ATA)
class = ATA_DEV_ATAPI;
else
class = ATA_DEV_ATA;
goto retry;
}
/* Control reaches here iff the device aborted
* both flavors of IDENTIFYs which happens
* sometimes with phantom devices.
*/
ata_dev_printk(dev, KERN_DEBUG,
"both IDENTIFYs aborted, assuming NODEV\n");
return -ENOENT;
}
rc = -EIO;