4.4-stable review patch. If anyone has any objections, please let me know.
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From: Joakim Tjernlund joakim.tjernlund@infinera.com
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@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 | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-)
--- a/drivers/mtd/chips/cfi_cmdset_0002.c +++ b/drivers/mtd/chips/cfi_cmdset_0002.c @@ -2551,8 +2551,9 @@ 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; @@ -2570,8 +2571,8 @@ 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 @@ -2609,7 +2610,7 @@ 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;