From f1ce87f6080b1dda7e7b1eda3da332add19d87b9 Mon Sep 17 00:00:00 2001
From: Joakim Tjernlund <joakim.tjernlund@infinera.com>
Date: Wed, 6 Jun 2018 12:13:30 +0200
Subject: [PATCH] mtd: cfi_cmdset_0002: Avoid walking all chips when unlocking.
Git-commit: f1ce87f6080b1dda7e7b1eda3da332add19d87b9
Patch-mainline: v4.18-rc3
References: bsc#1051510
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>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/mtd/chips/cfi_cmdset_0002.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/mtd/chips/cfi_cmdset_0002.c b/drivers/mtd/chips/cfi_cmdset_0002.c
index 9cfc2645dd93..1b64ac8c5bc8 100644
--- a/drivers/mtd/chips/cfi_cmdset_0002.c
+++ b/drivers/mtd/chips/cfi_cmdset_0002.c
@@ -2676,6 +2676,8 @@ 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++;
--
2.16.4