4.9-stable review patch. If anyone has any objections, please let me know. ------------------ From: Joakim Tjernlund <joakim.tjernlund@xxxxxxxxxxxx> commit f93aa8c4de307069c270b2d81741961162bead6c upstream. do_ppb_xxlock() fails to add chip->start when querying for lock status (and chip_ready test), which caused false status reports. Fix that by adding adr += chip->start and adjust call sites accordingly. Fixes: 1648eaaa1575 ("mtd: cfi_cmdset_0002: Support Persistent Protection Bits (PPB) locking") Cc: stable@xxxxxxxxxxxxxxx Signed-off-by: Joakim Tjernlund <joakim.tjernlund@xxxxxxxxxxxx> Signed-off-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/mtd/chips/cfi_cmdset_0002.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) --- a/drivers/mtd/chips/cfi_cmdset_0002.c +++ b/drivers/mtd/chips/cfi_cmdset_0002.c @@ -2549,8 +2549,9 @@ static int __maybe_unused do_ppb_xxlock( unsigned long timeo; int ret; + adr += chip->start; mutex_lock(&chip->mutex); - ret = get_chip(map, chip, adr + chip->start, FL_LOCKING); + ret = get_chip(map, chip, adr, FL_LOCKING); if (ret) { mutex_unlock(&chip->mutex); return ret; @@ -2568,8 +2569,8 @@ static int __maybe_unused do_ppb_xxlock( if (thunk == DO_XXLOCK_ONEBLOCK_LOCK) { chip->state = FL_LOCKING; - map_write(map, CMD(0xA0), chip->start + adr); - map_write(map, CMD(0x00), chip->start + adr); + map_write(map, CMD(0xA0), adr); + map_write(map, CMD(0x00), adr); } else if (thunk == DO_XXLOCK_ONEBLOCK_UNLOCK) { /* * Unlocking of one specific sector is not supported, so we @@ -2607,7 +2608,7 @@ static int __maybe_unused do_ppb_xxlock( map_write(map, CMD(0x00), chip->start); chip->state = FL_READY; - put_chip(map, chip, adr + chip->start); + put_chip(map, chip, adr); mutex_unlock(&chip->mutex); return ret;