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| author | Joakim Tjernlund <joakim.tjernlund@infinera.com> | 2018-03-01 16:39:41 +0300 |
|---|---|---|
| committer | Boris Brezillon <boris.brezillon@bootlin.com> | 2018-04-24 18:42:15 +0300 |
| commit | 7b70eb14392a7cf505f9b358d06c33b5af73d1e7 (patch) | |
| tree | 0097cafcb7324cf33c0e3cadd9b33ade4e9df6e1 /drivers/mtd/chips | |
| parent | 46a16a2283f9e678a4e26829175e0c37a5191860 (diff) | |
| download | linux-7b70eb14392a7cf505f9b358d06c33b5af73d1e7.tar.xz | |
mtd: cfi: cmdset_0002: Do not allow read/write to suspend erase block.
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.
Taken from cfi_cmdset_0001 driver.
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>
Diffstat (limited to 'drivers/mtd/chips')
| -rw-r--r-- | drivers/mtd/chips/cfi_cmdset_0002.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/drivers/mtd/chips/cfi_cmdset_0002.c b/drivers/mtd/chips/cfi_cmdset_0002.c index 668e2cbc155b..692902df2598 100644 --- a/drivers/mtd/chips/cfi_cmdset_0002.c +++ b/drivers/mtd/chips/cfi_cmdset_0002.c @@ -816,9 +816,10 @@ static int get_chip(struct map_info *map, struct flchip *chip, unsigned long adr (mode == FL_WRITING && (cfip->EraseSuspend & 0x2)))) goto sleep; - /* We could check to see if we're trying to access the sector - * that is currently being erased. However, no user will try - * anything like that so we just wait for the timeout. */ + /* 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 */ /* It's harmless to issue the Erase-Suspend and Erase-Resume @@ -2267,6 +2268,7 @@ static int __xipram do_erase_chip(struct map_info *map, struct flchip *chip) chip->state = FL_ERASING; chip->erase_suspended = 0; chip->in_progress_block_addr = adr; + chip->in_progress_block_mask = ~(map->size - 1); INVALIDATE_CACHE_UDELAY(map, chip, adr, map->size, @@ -2356,6 +2358,7 @@ static int __xipram do_erase_oneblock(struct map_info *map, struct flchip *chip, chip->state = FL_ERASING; chip->erase_suspended = 0; chip->in_progress_block_addr = adr; + chip->in_progress_block_mask = ~(len - 1); INVALIDATE_CACHE_UDELAY(map, chip, adr, len, |