Patch "bus: mbus: fix window size calculation for 4GB windows" has been added to the 3.18-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

    bus: mbus: fix window size calculation for 4GB windows

to the 3.18-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     bus-mbus-fix-window-size-calculation-for-4gb-windows.patch
and it can be found in the queue-3.18 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 2bbbd96357ce76cc45ec722c00f654aa7b189112 Mon Sep 17 00:00:00 2001
From: Jan Luebbe <jlu@pengutronix.de>
Date: Mon, 28 Aug 2017 17:25:16 +0200
Subject: bus: mbus: fix window size calculation for 4GB windows

From: Jan Luebbe <jlu@pengutronix.de>

commit 2bbbd96357ce76cc45ec722c00f654aa7b189112 upstream.

At least the Armada XP SoC supports 4GB on a single DRAM window. Because
the size register values contain the actual size - 1, the MSB is set in
that case. For example, the SDRAM window's control register's value is
0xffffffe1 for 4GB (bits 31 to 24 contain the size).

The MBUS driver reads back each window's size from registers and
calculates the actual size as (control_reg | ~DDR_SIZE_MASK) + 1, which
overflows for 32 bit values, resulting in other miscalculations further
on (a bad RAM window for the CESA crypto engine calculated by
mvebu_mbus_setup_cpu_target_nooverlap() in my case).

This patch changes the type in 'struct mbus_dram_window' from u32 to
u64, which allows us to keep using the same register calculation code in
most MBUS-using drivers (which calculate ->size - 1 again).

Fixes: fddddb52a6c4 ("bus: introduce an Marvell EBU MBus driver")
Signed-off-by: Jan Luebbe <jlu@pengutronix.de>
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/bus/mvebu-mbus.c |    2 +-
 include/linux/mbus.h     |    4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

--- a/drivers/bus/mvebu-mbus.c
+++ b/drivers/bus/mvebu-mbus.c
@@ -523,7 +523,7 @@ mvebu_mbus_default_setup_cpu_target(stru
 			if (mbus->hw_io_coherency)
 				w->mbus_attr |= ATTR_HW_COHERENCY;
 			w->base = base & DDR_BASE_CS_LOW_MASK;
-			w->size = (size | ~DDR_SIZE_MASK) + 1;
+			w->size = (u64)(size | ~DDR_SIZE_MASK) + 1;
 		}
 	}
 	mvebu_mbus_dram_info.num_cs = cs;
--- a/include/linux/mbus.h
+++ b/include/linux/mbus.h
@@ -29,8 +29,8 @@ struct mbus_dram_target_info
 	struct mbus_dram_window {
 		u8	cs_index;
 		u8	mbus_attr;
-		u32	base;
-		u32	size;
+		u64	base;
+		u64	size;
 	} cs[4];
 };
 


Patches currently in stable-queue which might be from jlu@pengutronix.de are

queue-3.18/bus-mbus-fix-window-size-calculation-for-4gb-windows.patch