--- /dev/null
+From f5cf8f07423b2677cebebcebc863af77223a4972 Mon Sep 17 00:00:00 2001
+From: David Woodhouse <David.Woodhouse@intel.com>
+Date: Tue, 9 Oct 2012 15:08:10 +0100
+Subject: mtd: Disable mtdchar mmap on MMU systems
+
+From: David Woodhouse <David.Woodhouse@intel.com>
+
+commit f5cf8f07423b2677cebebcebc863af77223a4972 upstream.
+
+This code was broken because it assumed that all MTD devices were map-based.
+Disable it for now, until it can be fixed properly for the next merge window.
+
+Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+
+---
+ drivers/mtd/mtdchar.c | 6 +++++-
+ 1 file changed, 5 insertions(+), 1 deletion(-)
+
+--- a/drivers/mtd/mtdchar.c
++++ b/drivers/mtd/mtdchar.c
+@@ -1103,7 +1103,11 @@ static int mtd_mmap(struct file *file, s
+ resource_size_t start, off;
+ unsigned long len, vma_len;
+
+- if (mtd->type == MTD_RAM || mtd->type == MTD_ROM) {
++ /* This is broken because it assumes the MTD device is map-based
++ and that mtd->priv is a valid struct map_info. It should be
++ replaced with something that uses the mtd_get_unmapped_area()
++ operation properly. */
++ if (0 /*mtd->type == MTD_RAM || mtd->type == MTD_ROM*/) {
+ off = get_vm_offset(vma);
+ start = map->phys;
+ len = PAGE_ALIGN((start & ~PAGE_MASK) + map->size);