[PATCH] Fix corner case in bad block table handling.

[Doyle, Patrick]

In the unlikely event that both blocks 10 and 11 are marked as bad (on a
32 bit machine), then the process of marking block 10 as bad stomps on
cached entry for block 11.  There are (of course) other examples.

Signed-off-by: Patrick Doyle <pdoyle at irobot.com>
---
 drivers/mtd/nand/bbt.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mtd/nand/bbt.c b/drivers/mtd/nand/bbt.c
index 7e0ad3190c..eb1184aadb 100644
--- a/drivers/mtd/nand/bbt.c
+++ b/drivers/mtd/nand/bbt.c
@@ -124,7 +124,7 @@ int nanddev_bbt_set_block_status(struct nand_device *nand, unsigned int entry,
 		unsigned int rbits = bits_per_block + offs - BITS_PER_LONG;
 
 		pos[1] &= ~GENMASK(rbits - 1, 0);
-		pos[1] |= val >> rbits;
+		pos[1] |= val >> (bits_per_block - rbits);
 	}
 
 	return 0;
-- 
2.24.1