libata-sff: kill unused ata_bus_reset()

... since I see no callers of it.

Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

Documentation/DocBook/libata.tmpl

@@ -81,16 +81,14 @@ void (*port_disable) (struct ata_port *);
 	</programlisting>
 
 	<para>
-	Called from ata_bus_probe() and ata_bus_reset() error paths,
-	as well as when unregistering from the SCSI module (rmmod, hot
-	unplug).
+	Called from 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, ata_port_disable() can be used
 	as this hook.
 	</para>
 	<para>
 	Called from ata_bus_probe() on a failed probe.
-	Called from ata_bus_reset() on a failed bus reset.
 	Called from ata_scsi_release().
 	</para>
 

drivers/ata/libata-sff.c

@@ -2631,100 +2631,6 @@ u8 ata_bmdma_status(struct ata_port *ap)
 }
 EXPORT_SYMBOL_GPL(ata_bmdma_status);
 
-/**
- *	ata_bus_reset - reset host port and associated ATA channel
- *	@ap: port to reset
- *
- *	This is typically the first time we actually start issuing
- *	commands to the ATA channel.  We wait for BSY to clear, then
- *	issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
- *	result.  Determine what devices, if any, are on the channel
- *	by looking at the device 0/1 error register.  Look at the signature
- *	stored in each device's taskfile registers, to determine if
- *	the device is ATA or ATAPI.
- *
- *	LOCKING:
- *	PCI/etc. bus probe sem.
- *	Obtains host lock.
- *
- *	SIDE EFFECTS:
- *	Sets ATA_FLAG_DISABLED if bus reset fails.
- *
- *	DEPRECATED:
- *	This function is only for drivers which still use old EH and
- *	will be removed soon.
- */
-void ata_bus_reset(struct ata_port *ap)
-{
-	struct ata_device *device = ap->link.device;
-	struct ata_ioports *ioaddr = &ap->ioaddr;
-	unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
-	u8 err;
-	unsigned int dev0, dev1 = 0, devmask = 0;
-	int rc;
-
-	DPRINTK("ENTER, host %u, port %u\n", ap->print_id, ap->port_no);
-
-	/* determine if device 0/1 are present */
-	if (ap->flags & ATA_FLAG_SATA_RESET)
-		dev0 = 1;
-	else {
-		dev0 = ata_devchk(ap, 0);
-		if (slave_possible)
-			dev1 = ata_devchk(ap, 1);
-	}
-
-	if (dev0)
-		devmask |= (1 << 0);
-	if (dev1)
-		devmask |= (1 << 1);
-
-	/* select device 0 again */
-	ap->ops->sff_dev_select(ap, 0);
-
-	/* issue bus reset */
-	if (ap->flags & ATA_FLAG_SRST) {
-		rc = ata_bus_softreset(ap, devmask,
-				       ata_deadline(jiffies, 40000));
-		if (rc && rc != -ENODEV)
-			goto err_out;
-	}
-
-	/*
-	 * determine by signature whether we have ATA or ATAPI devices
-	 */
-	device[0].class = ata_sff_dev_classify(&device[0], dev0, &err);
-	if ((slave_possible) && (err != 0x81))
-		device[1].class = ata_sff_dev_classify(&device[1], dev1, &err);
-
-	/* is double-select really necessary? */
-	if (device[1].class != ATA_DEV_NONE)
-		ap->ops->sff_dev_select(ap, 1);
-	if (device[0].class != ATA_DEV_NONE)
-		ap->ops->sff_dev_select(ap, 0);
-
-	/* if no devices were detected, disable this port */
-	if ((device[0].class == ATA_DEV_NONE) &&
-	    (device[1].class == ATA_DEV_NONE))
-		goto err_out;
-
-	if (ap->flags & (ATA_FLAG_SATA_RESET | ATA_FLAG_SRST)) {
-		/* set up device control for ATA_FLAG_SATA_RESET */
-		iowrite8(ap->ctl, ioaddr->ctl_addr);
-		ap->last_ctl = ap->ctl;
-	}
-
-	DPRINTK("EXIT\n");
-	return;
-
-err_out:
-	ata_port_printk(ap, KERN_ERR, "disabling port\n");
-	ata_port_disable(ap);
-
-	DPRINTK("EXIT\n");
-}
-EXPORT_SYMBOL_GPL(ata_bus_reset);
-
 #ifdef CONFIG_PCI
 
 /**

include/linux/libata.h

@@ -1631,7 +1631,6 @@ extern void ata_bmdma_setup(struct ata_queued_cmd *qc);
 extern void ata_bmdma_start(struct ata_queued_cmd *qc);
 extern void ata_bmdma_stop(struct ata_queued_cmd *qc);
 extern u8 ata_bmdma_status(struct ata_port *ap);
-extern void ata_bus_reset(struct ata_port *ap);
 
 #ifdef CONFIG_PCI
 extern int ata_pci_bmdma_clear_simplex(struct pci_dev *pdev);