4.17-stable review patch. If anyone has any objections, please let me know.
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From: Joakim Tjernlund joakim.tjernlund@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") 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
--- 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 @@ -2665,6 +2665,8 @@ static int __maybe_unused cfi_ppb_unlock i++;
if (adr >> cfi->chipshift) { + if (offset >= (ofs + len)) + break; adr = 0; chipnum++;