ata: libata-core: remove ata_bus_probe()

Remove ata_bus_probe() as it is unused.

Also, remove references to ata_bus_probe and port_disable in
Documentation/driver-api/libata.rst, as neither exist anymore.

Signed-off-by: Niklas Cassel <niklas.cassel@wdc.com>
Reviewed-by: John Garry <john.g.garry@oracle.com>
Reviewed-by: Jason Yan <yanaijie@huawei.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Damien Le Moal <dlemoal@kernel.org>

Author: Niklas Cassel

Documentation/driver-api/libata.rst

@@ -32,22 +32,6 @@ register blocks.
 :c:type:`struct ata_port_operations <ata_port_operations>`
 ----------------------------------------------------------
 
-Disable ATA port
-~~~~~~~~~~~~~~~~
-
-::
-
-    void (*port_disable) (struct ata_port *);
-
-
-Called from :c:func:`ata_bus_probe` error path, as well as when unregistering
-from the SCSI module (rmmod, hot unplug). This function should do
-whatever needs to be done to take the port out of use. In most cases,
-:c:func:`ata_port_disable` can be used as this hook.
-
-Called from :c:func:`ata_bus_probe` on a failed probe. Called from
-:c:func:`ata_scsi_release`.
-
 Post-IDENTIFY device configuration
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 

drivers/ata/libata-core.c

@@ -3057,144 +3057,6 @@ int ata_cable_sata(struct ata_port *ap)
 }
 EXPORT_SYMBOL_GPL(ata_cable_sata);
 
-/**
- *	ata_bus_probe - Reset and probe ATA bus
- *	@ap: Bus to probe
- *
- *	Master ATA bus probing function.  Initiates a hardware-dependent
- *	bus reset, then attempts to identify any devices found on
- *	the bus.
- *
- *	LOCKING:
- *	PCI/etc. bus probe sem.
- *
- *	RETURNS:
- *	Zero on success, negative errno otherwise.
- */
-
-int ata_bus_probe(struct ata_port *ap)
-{
-	unsigned int classes[ATA_MAX_DEVICES];
-	int tries[ATA_MAX_DEVICES];
-	int rc;
-	struct ata_device *dev;
-
-	ata_for_each_dev(dev, &ap->link, ALL)
-		tries[dev->devno] = ATA_PROBE_MAX_TRIES;
-
- retry:
-	ata_for_each_dev(dev, &ap->link, ALL) {
-		/* If we issue an SRST then an ATA drive (not ATAPI)
-		 * may change configuration and be in PIO0 timing. If
-		 * we do a hard reset (or are coming from power on)
-		 * this is true for ATA or ATAPI. Until we've set a
-		 * suitable controller mode we should not touch the
-		 * bus as we may be talking too fast.
-		 */
-		dev->pio_mode = XFER_PIO_0;
-		dev->dma_mode = 0xff;
-
-		/* If the controller has a pio mode setup function
-		 * then use it to set the chipset to rights. Don't
-		 * touch the DMA setup as that will be dealt with when
-		 * configuring devices.
-		 */
-		if (ap->ops->set_piomode)
-			ap->ops->set_piomode(ap, dev);
-	}
-
-	/* reset and determine device classes */
-	ap->ops->phy_reset(ap);
-
-	ata_for_each_dev(dev, &ap->link, ALL) {
-		if (dev->class != ATA_DEV_UNKNOWN)
-			classes[dev->devno] = dev->class;
-		else
-			classes[dev->devno] = ATA_DEV_NONE;
-
-		dev->class = ATA_DEV_UNKNOWN;
-	}
-
-	/* read IDENTIFY page and configure devices. We have to do the identify
-	   specific sequence bass-ackwards so that PDIAG- is released by
-	   the slave device */
-
-	ata_for_each_dev(dev, &ap->link, ALL_REVERSE) {
-		if (tries[dev->devno])
-			dev->class = classes[dev->devno];
-
-		if (!ata_dev_enabled(dev))
-			continue;
-
-		rc = ata_dev_read_id(dev, &dev->class, ATA_READID_POSTRESET,
-				     dev->id);
-		if (rc)
-			goto fail;
-	}
-
-	/* Now ask for the cable type as PDIAG- should have been released */
-	if (ap->ops->cable_detect)
-		ap->cbl = ap->ops->cable_detect(ap);
-
-	/* We may have SATA bridge glue hiding here irrespective of
-	 * the reported cable types and sensed types.  When SATA
-	 * drives indicate we have a bridge, we don't know which end
-	 * of the link the bridge is which is a problem.
-	 */
-	ata_for_each_dev(dev, &ap->link, ENABLED)
-		if (ata_id_is_sata(dev->id))
-			ap->cbl = ATA_CBL_SATA;
-
-	/* After the identify sequence we can now set up the devices. We do
-	   this in the normal order so that the user doesn't get confused */
-
-	ata_for_each_dev(dev, &ap->link, ENABLED) {
-		ap->link.eh_context.i.flags |= ATA_EHI_PRINTINFO;
-		rc = ata_dev_configure(dev);
-		ap->link.eh_context.i.flags &= ~ATA_EHI_PRINTINFO;
-		if (rc)
-			goto fail;
-	}
-
-	/* configure transfer mode */
-	rc = ata_set_mode(&ap->link, &dev);
-	if (rc)
-		goto fail;
-
-	ata_for_each_dev(dev, &ap->link, ENABLED)
-		return 0;
-
-	return -ENODEV;
-
- fail:
-	tries[dev->devno]--;
-
-	switch (rc) {
-	case -EINVAL:
-		/* eeek, something went very wrong, give up */
-		tries[dev->devno] = 0;
-		break;
-
-	case -ENODEV:
-		/* give it just one more chance */
-		tries[dev->devno] = min(tries[dev->devno], 1);
-		fallthrough;
-	case -EIO:
-		if (tries[dev->devno] == 1) {
-			/* This is the last chance, better to slow
-			 * down than lose it.
-			 */
-			sata_down_spd_limit(&ap->link, 0);
-			ata_down_xfermask_limit(dev, ATA_DNXFER_PIO);
-		}
-	}
-
-	if (!tries[dev->devno])
-		ata_dev_disable(dev);
-
-	goto retry;
-}
-
 /**
  *	sata_print_link_status - Print SATA link status
  *	@link: SATA link to printk link status about

drivers/ata/libata.h

@@ -122,7 +122,6 @@ extern void ata_scsi_media_change_notify(struct ata_device *dev);
 extern void ata_scsi_hotplug(struct work_struct *work);
 extern void ata_schedule_scsi_eh(struct Scsi_Host *shost);
 extern void ata_scsi_dev_rescan(struct work_struct *work);
-extern int ata_bus_probe(struct ata_port *ap);
 extern int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel,
 			      unsigned int id, u64 lun);
 void ata_scsi_sdev_config(struct scsi_device *sdev);

include/linux/libata.h

@@ -344,7 +344,6 @@ enum {
 	ATA_LINK_RESUME_TRIES	= 5,
 
 	/* how hard are we gonna try to probe/recover devices */
-	ATA_PROBE_MAX_TRIES	= 3,
 	ATA_EH_DEV_TRIES	= 3,
 	ATA_EH_PMP_TRIES	= 5,
 	ATA_EH_PMP_LINK_TRIES	= 3,