diff options
| author | Joakim Tjernlund <joakim.tjernlund@transmode.se> | 2018-03-01 14:39:39 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-05-01 15:13:07 -0700 |
| commit | 54a21fe4d8bbb0e82ac75e55bb8d46c4c3326ee4 (patch) | |
| tree | 56b1632857b85f52e25c69ed6985c7431dcf9ff7 /drivers | |
| parent | d197dfc89cfb9b2afb014f098a55be77102c6cba (diff) | |
mtd: cfi: cmdset_0001: Do not allow read/write to suspend erase block.
commit 6510bbc88e3258631831ade49033537081950605 upstream.
Currently it is possible to read and/or write to suspend EB's.
Writing /dev/mtdX or /dev/mtdblockX from several processes may
break the flash state machine.
Signed-off-by: Joakim Tjernlund <joakim.tjernlund@infinera.com>
Cc: <stable@vger.kernel.org>
Reviewed-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/mtd/chips/cfi_cmdset_0001.c | 16 |
1 files changed, 11 insertions, 5 deletions
diff --git a/drivers/mtd/chips/cfi_cmdset_0001.c b/drivers/mtd/chips/cfi_cmdset_0001.c index 5e1b68cbcd0a..a239ed4cb076 100644 --- a/drivers/mtd/chips/cfi_cmdset_0001.c +++ b/drivers/mtd/chips/cfi_cmdset_0001.c @@ -831,21 +831,25 @@ static int chip_ready (struct map_info *map, struct flchip *chip, unsigned long (mode == FL_WRITING && (cfip->SuspendCmdSupport & 1)))) goto sleep; + /* Do not allow suspend iff read/write to EB address */ + if ((adr & chip->in_progress_block_mask) == + chip->in_progress_block_addr) + goto sleep; /* Erase suspend */ - map_write(map, CMD(0xB0), adr); + map_write(map, CMD(0xB0), chip->in_progress_block_addr); /* If the flash has finished erasing, then 'erase suspend' * appears to make some (28F320) flash devices switch to * 'read' mode. Make sure that we switch to 'read status' * mode so we get the right data. --rmk */ - map_write(map, CMD(0x70), adr); + map_write(map, CMD(0x70), chip->in_progress_block_addr); chip->oldstate = FL_ERASING; chip->state = FL_ERASE_SUSPENDING; chip->erase_suspended = 1; for (;;) { - status = map_read(map, adr); + status = map_read(map, chip->in_progress_block_addr); if (map_word_andequal(map, status, status_OK, status_OK)) break; @@ -1041,8 +1045,8 @@ static void put_chip(struct map_info *map, struct flchip *chip, unsigned long ad sending the 0x70 (Read Status) command to an erasing chip and expecting it to be ignored, that's what we do. */ - map_write(map, CMD(0xd0), adr); - map_write(map, CMD(0x70), adr); + map_write(map, CMD(0xd0), chip->in_progress_block_addr); + map_write(map, CMD(0x70), chip->in_progress_block_addr); chip->oldstate = FL_READY; chip->state = FL_ERASING; break; @@ -1933,6 +1937,8 @@ static int __xipram do_erase_oneblock(struct map_info *map, struct flchip *chip, map_write(map, CMD(0xD0), adr); chip->state = FL_ERASING; chip->erase_suspended = 0; + chip->in_progress_block_addr = adr; + chip->in_progress_block_mask = ~(len - 1); ret = INVAL_CACHE_AND_WAIT(map, chip, adr, adr, len, |