libata: Fix early use of port printk. (Was Re: ata4294967295: failed to start port (errno=-19))

On Fri, 30 Nov 2007 14:34:11 +0200 (EET)
Meelis Roos <mroos@linux.ee> wrote:

> > Can you stick a stack trace in at that point ? That would help diagnose
> > it a great deal quicker.
>
> Finally done - found out hard way that BUG() is too bad and
> dump_st5ack() suits me better.

Thanks. This should fix the real cause, and also allow for port start to
fail politely with -ENODEV.
Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

drivers/ata/libata-core.c

@@ -6967,12 +6967,11 @@ int ata_host_start(struct ata_host *host)
 		if (ap->ops->port_start) {
 			rc = ap->ops->port_start(ap);
 			if (rc) {
-				ata_port_printk(ap, KERN_ERR, "failed to "
-						"start port (errno=%d)\n", rc);
+				if (rc != -ENODEV)
+					dev_printk(KERN_ERR, host->dev, "failed to start port %d (errno=%d)\n", i, rc);
 				goto err_out;
 			}
 		}
-
 		ata_eh_freeze_port(ap);
 	}