linux-kernel - [PATCH] ata: fix wrong WARN_ON

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Date:	Tue, 13 Jan 2009 10:38:36 +0100
From:	Christian Borntraeger <borntraeger@...ibm.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>, Jeff Garzik <jeff@...zik.org>
Cc:	Sergei Shtylyov <sshtylyov@...mvista.com>,
	Ingo Molnar <mingo@...e.hu>, linux-ide@...r.kernel.org,
	lkml <linux-kernel@...r.kernel.org>
Subject: [PATCH] ata: fix wrong WARN_ON_ONCE

Jeff, Alan,

this is still not fixed upstream. What about:

[PATCH] ata: fix wrong WARN_ON_ONCE

This patch fixes a wrong WARN_ON that was triggered by 32bit PIO support:
WARNING: at drivers/ata/libata-sff.c:1017 ata_sff_hsm_move+0x45e/0x750()

__atapi_pio_bytes simply doesnt know enough to decide if there is a bug.

Signed-off-by: Christian Borntraeger <borntraeger@...ibm.com>
---
 drivers/ata/libata-sff.c |    9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

Index: linux-2.6/drivers/ata/libata-sff.c
===================================================================
--- linux-2.6.orig/drivers/ata/libata-sff.c
+++ linux-2.6/drivers/ata/libata-sff.c
@@ -1013,9 +1013,12 @@ next_sg:
 		qc->cursg_ofs = 0;
 	}
 
-	/* consumed can be larger than count only for the last transfer */
-	WARN_ON_ONCE(qc->cursg && count != consumed);
-
+	/*
+	 * There used to be a  WARN_ON_ONCE(qc->cursg && count != consumed);
+	 * Unfortunately __atapi_pio_bytes doesn't know enough to do the WARN
+	 * check correctly as it doesn't know if it is the last request being
+	 * made. Somebody should implement a proper sanity check.
+	 */
 	if (bytes)
 		goto next_sg;
 	return 0;
--
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