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authorDavid Woodhouse <David.Woodhouse@intel.com>2012-10-09 15:08:10 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-04-16 21:02:31 -0700
commitc6c8807630f086872b446cc66752a1835df5e9d7 (patch)
treed026d7bb3c51ce7c68e8026d07f48af3bcb95c07
parentf0776cdd7c35a4b4ca7b80e6afc4ecd0d26831d7 (diff)
mtd: Disable mtdchar mmap on MMU systems
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>
-rw-r--r--drivers/mtd/mtdchar.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/mtd/mtdchar.c b/drivers/mtd/mtdchar.c
index 2434e9d685df..9892dcc8fc01 100644
--- a/drivers/mtd/mtdchar.c
+++ b/drivers/mtd/mtdchar.c
@@ -1103,7 +1103,11 @@ static int mtd_mmap(struct file *file, struct vm_area_struct *vma)
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);