linux-kernel - [PATCH 1/7] edac: mpc85xx fix bad page calculation

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Date:	Wed, 03 Feb 2010 23:46:17 -0700
From:	dougthompson@...ssion.com
To:	ptyser@...-inc.com, bluesmoke-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org
Subject: [PATCH 1/7] edac: mpc85xx fix bad page calculation

From: Peter Tyser <ptyser@...-inc.com>

Commit b4846251727a38a7f248e41308c060995371dd05 accidentally broke how a
chip select's first and last page addresses are calculated.  The page
addresses are being shifted too far right by PAGE_SHIFT.  This results
in errors such as:

  EDAC MPC85xx MC1: Err addr: 0x003075c0
  EDAC MPC85xx MC1: PFN: 0x00000307
  EDAC MPC85xx MC1: PFN out of range!
  EDAC MC1: INTERNAL ERROR: row out of range (4 >= 4)
  EDAC MC1: CE - no information available: INTERNAL ERROR

The vale of PAGE_SHIFT is already being taken into consideration during
the calculation of the 'start' and 'end' variables, thus it is not
necessary to account for it again when setting a chip select's first and
last page address.

Signed-off-by: Peter Tyser <ptyser@...-inc.com>
Signed-off-by: Doug Thompson <dougthompson@...ssion.com>
---
 drivers/edac/mpc85xx_edac.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

Index: linux-2.6.33-rc4/drivers/edac/mpc85xx_edac.c
===================================================================
--- linux-2.6.33-rc4.orig/drivers/edac/mpc85xx_edac.c	2010-01-13 00:15:58.000000000 -0700
+++ linux-2.6.33-rc4/drivers/edac/mpc85xx_edac.c	2010-01-13 00:16:00.000000000 -0700
@@ -804,8 +804,8 @@ static void __devinit mpc85xx_init_csrow
 		end   <<= (24 - PAGE_SHIFT);
 		end    |= (1 << (24 - PAGE_SHIFT)) - 1;

-		csrow->first_page = start >> PAGE_SHIFT;
-		csrow->last_page = end >> PAGE_SHIFT;
+		csrow->first_page = start;
+		csrow->last_page = end;
 		csrow->nr_pages = end + 1 - start;
 		csrow->grain = 8;
 		csrow->mtype = mtype;
--
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