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

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Date:	Fri, 30 Nov 2007 15:23:16 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Meelis Roos <mroos@...ux.ee>
Cc:	Linux Kernel list <linux-kernel@...r.kernel.org>, jeff@...zik.org,
	akpm@...l.org
Subject: [PATCH] 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@...ux.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@...hat.com>

diff -u --new-file --recursive --exclude-from /usr/src/exclude linux.vanilla-2.6.24-rc2-mm1/drivers/ata/libata-core.c linux-2.6.24-rc2-mm1/drivers/ata/libata-core.c
--- linux.vanilla-2.6.24-rc2-mm1/drivers/ata/libata-core.c	2007-11-16 17:55:11.000000000 +0000
+++ linux-2.6.24-rc2-mm1/drivers/ata/libata-core.c	2007-11-30 14:31:56.093473744 +0000
@@ -6999,12 +7014,11 @@
 		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);
 	}
 


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