linux-kernel - [012/129] pata_cmd64x: revert commit d62f5576

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Date:	Sat, 18 Sep 2010 12:11:50 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Tejun Heo <tj@...nel.org>,
	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	Jeff Garzik <jgarzik@...hat.com>
Subject: [012/129] pata_cmd64x: revert commit d62f5576

2.6.35-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Tejun Heo <tj@...nel.org>

commit aba8a08ded89a74f1ba04ae94ecc98f26e27d41c upstream.

Commit d62f5576 (pata_cmd64x: fix handling of address setup timings)
incorrectly called ata_timing_compute() on UDMA mode on 0 @UT leading
to devide by zero fault.  Revert it until better fix is available.
This is reported in bko#16607 by Milan Kocian who also root caused it.

  https://bugzilla.kernel.org/show_bug.cgi?id=16607

Signed-off-by: Tejun Heo <tj@...nel.org>
Reported-and-root-caused-by: Milan Kocian <milan.kocian@...cz>
Cc: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
Signed-off-by: Jeff Garzik <jgarzik@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/ata/pata_cmd64x.c |    6 ------
 1 file changed, 6 deletions(-)

--- a/drivers/ata/pata_cmd64x.c
+++ b/drivers/ata/pata_cmd64x.c
@@ -121,14 +121,8 @@ static void cmd64x_set_timing(struct ata
 
 		if (pair) {
 			struct ata_timing tp;
-
 			ata_timing_compute(pair, pair->pio_mode, &tp, T, 0);
 			ata_timing_merge(&t, &tp, &t, ATA_TIMING_SETUP);
-			if (pair->dma_mode) {
-				ata_timing_compute(pair, pair->dma_mode,
-						&tp, T, 0);
-				ata_timing_merge(&tp, &t, &t, ATA_TIMING_SETUP);
-			}
 		}
 	}
 


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