libata: IDENTIFY backwards for drive side cable detection
For drive side cable detection to work correctly, drives need to be
identified backwards such that the slave device releases PDIAG- before
the mater drive tries to detect cable type. ata_bus_probe() was fixed
by commit f31f0cc2f0
but the new EH path
wasn't fixed. This patch makes new EH path do IDENTIFY backwards.
ata_dev_configure() for new devices are still performed master first.
This is to keep the detection messages in forward order.
Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
parent
55a61604cd
commit
8c3c52a8f0
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@ -1743,12 +1743,17 @@ static int ata_eh_revalidate_and_attach(struct ata_port *ap,
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{
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struct ata_eh_context *ehc = &ap->eh_context;
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struct ata_device *dev;
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unsigned int new_mask = 0;
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unsigned long flags;
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int i, rc = 0;
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DPRINTK("ENTER\n");
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for (i = 0; i < ATA_MAX_DEVICES; i++) {
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/* For PATA drive side cable detection to work, IDENTIFY must
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* be done backwards such that PDIAG- is released by the slave
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* device before the master device is identified.
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*/
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for (i = ATA_MAX_DEVICES - 1; i >= 0; i--) {
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unsigned int action, readid_flags = 0;
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dev = &ap->device[i];
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@ -1760,13 +1765,13 @@ static int ata_eh_revalidate_and_attach(struct ata_port *ap,
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if (action & ATA_EH_REVALIDATE && ata_dev_ready(dev)) {
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if (ata_port_offline(ap)) {
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rc = -EIO;
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break;
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goto err;
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}
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ata_eh_about_to_do(ap, dev, ATA_EH_REVALIDATE);
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rc = ata_dev_revalidate(dev, readid_flags);
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if (rc)
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break;
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goto err;
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ata_eh_done(ap, dev, ATA_EH_REVALIDATE);
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@ -1784,40 +1789,53 @@ static int ata_eh_revalidate_and_attach(struct ata_port *ap,
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rc = ata_dev_read_id(dev, &dev->class, readid_flags,
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dev->id);
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if (rc == 0) {
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ehc->i.flags |= ATA_EHI_PRINTINFO;
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rc = ata_dev_configure(dev);
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ehc->i.flags &= ~ATA_EHI_PRINTINFO;
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} else if (rc == -ENOENT) {
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switch (rc) {
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case 0:
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new_mask |= 1 << i;
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break;
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case -ENOENT:
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/* IDENTIFY was issued to non-existent
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* device. No need to reset. Just
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* thaw and kill the device.
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*/
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ata_eh_thaw_port(ap);
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dev->class = ATA_DEV_UNKNOWN;
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rc = 0;
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}
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if (rc) {
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dev->class = ATA_DEV_UNKNOWN;
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break;
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}
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if (ata_dev_enabled(dev)) {
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spin_lock_irqsave(ap->lock, flags);
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ap->pflags |= ATA_PFLAG_SCSI_HOTPLUG;
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spin_unlock_irqrestore(ap->lock, flags);
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/* new device discovered, configure xfermode */
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ehc->i.flags |= ATA_EHI_SETMODE;
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default:
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dev->class = ATA_DEV_UNKNOWN;
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goto err;
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}
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}
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}
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if (rc)
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*r_failed_dev = dev;
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/* Configure new devices forward such that user doesn't see
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* device detection messages backwards.
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*/
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for (i = 0; i < ATA_MAX_DEVICES; i++) {
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dev = &ap->device[i];
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DPRINTK("EXIT\n");
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if (!(new_mask & (1 << i)))
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continue;
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ehc->i.flags |= ATA_EHI_PRINTINFO;
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rc = ata_dev_configure(dev);
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ehc->i.flags &= ~ATA_EHI_PRINTINFO;
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if (rc)
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goto err;
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spin_lock_irqsave(ap->lock, flags);
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ap->pflags |= ATA_PFLAG_SCSI_HOTPLUG;
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spin_unlock_irqrestore(ap->lock, flags);
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/* new device discovered, configure xfermode */
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ehc->i.flags |= ATA_EHI_SETMODE;
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}
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return 0;
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err:
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*r_failed_dev = dev;
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DPRINTK("EXIT rc=%d\n", rc);
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return rc;
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}
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