mtd: cfi_cmdset_0002: Avoid walking all chips when unlocking.

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")
Cc: stable@vger.kernel.org
Signed-off-by: Joakim Tjernlund <joakim.tjernlund@infinera.com>
Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/mtd/chips/cfi_cmdset_0002.c b/drivers/mtd/chips/cfi_cmdset_0002.c
index cfddd0f9985ac13b1c2bd71befe9200c74eef321..c484ca8c909c7e1144ed233f82ae74f39cc9167e 100644 (file)
--- a/drivers/mtd/chips/cfi_cmdset_0002.c
+++ b/drivers/mtd/chips/cfi_cmdset_0002.c
@@ -2683,6 +2683,8 @@ static int __maybe_unused cfi_ppb_unlock(struct mtd_info *mtd, loff_t ofs,
                        i++;
 
                if (adr >> cfi->chipshift) {
+                       if (offset >= (ofs + len))
+                               break;
                        adr = 0;
                        chipnum++;