[PATCH 3.16 180/366] mtd: cfi_cmdset_0002: Avoid walking all chips when unlocking.

[Ben Hutchings]

3.16.61-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Joakim Tjernlund <joakim.tjernl...@infinera.com>

commit f1ce87f6080b1dda7e7b1eda3da332add19d87b9 upstream.

cfi_ppb_unlock() walks all flash chips when unlocking sectors,
avoid walking chips unaffected by the unlock operation.

Fixes: 1648eaaa1575 ("mtd: cfi_cmdset_0002: Support Persistent Protection Bits 
(PPB) locking")
Signed-off-by: Joakim Tjernlund <joakim.tjernl...@infinera.com>
Signed-off-by: Boris Brezillon <boris.brezil...@bootlin.com>
Signed-off-by: Ben Hutchings <b...@decadent.org.uk>
---
 drivers/mtd/chips/cfi_cmdset_0002.c | 2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/mtd/chips/cfi_cmdset_0002.c
+++ b/drivers/mtd/chips/cfi_cmdset_0002.c
@@ -2356,6 +2356,8 @@ static int __maybe_unused cfi_ppb_unlock
                        i++;
 
                if (adr >> cfi->chipshift) {
+                       if (offset >= (ofs + len))
+                               break;
                        adr = 0;
                        chipnum++;