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 7b70eb14392a7cf505f9b358d06c33b5af73d1e7 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.
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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/mtd/chips/cfi_cmdset_0002.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-)
--- a/drivers/mtd/chips/cfi_cmdset_0002.c +++ b/drivers/mtd/chips/cfi_cmdset_0002.c @@ -814,9 +814,10 @@ static int get_chip(struct map_info *map (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 @@ -2265,6 +2266,7 @@ static int __xipram do_erase_chip(struct 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, @@ -2354,6 +2356,7 @@ static int __xipram do_erase_oneblock(st 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,