mtd: nftl: fix offset alignments

Arithmetic conversion in the mask computation makes the upper word
of the second argument passed down to mtd->read_oob(), be always 0
(assuming 'offs' being a 64-bit signed long long type, and
'mtd->writesize' being a 32-bit unsigned int type).

This patch applies over the other one adding masking in nftl_write,
"nftl: write support is broken".

Signed-off-by: Dimitri Gorokhovik <dimitri.gorokhovik@free.fr>
Cc: Tim Gardner <tim.gardner@canonical.com>
Cc: Scott James Remnant <scott@canonical.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

1 files changed, 9 insertions, 6 deletions

diff --git a/drivers/mtd/nftlcore.c b/drivers/mtd/nftlcore.c
index 665d3eba2f47..1002e1882996 100644
--- a/drivers/mtd/nftlcore.c
+++ b/drivers/mtd/nftlcore.c
@@ -135,16 +135,17 @@ static void nftl_remove_dev(struct mtd_blktrans_dev *dev)
 int nftl_read_oob(struct mtd_info *mtd, loff_t offs, size_t len,
                   size_t *retlen, uint8_t *buf)
 {
+        loff_t mask = mtd->writesize - 1;
         struct mtd_oob_ops ops;
         int res;
 
         ops.mode = MTD_OOB_PLACE;
-        ops.ooboffs = offs & (mtd->writesize - 1);
+        ops.ooboffs = offs & mask;
         ops.ooblen = len;
         ops.oobbuf = buf;
         ops.datbuf = NULL;
 
-        res = mtd->read_oob(mtd, offs & ~(mtd->writesize - 1), &ops);
+        res = mtd->read_oob(mtd, offs & ~mask, &ops);
         *retlen = ops.oobretlen;
         return res;
 }
@@ -155,16 +156,17 @@ int nftl_read_oob(struct mtd_info *mtd, loff_t offs, size_t len,
 int nftl_write_oob(struct mtd_info *mtd, loff_t offs, size_t len,
                    size_t *retlen, uint8_t *buf)
 {
+        loff_t mask = mtd->writesize - 1;
         struct mtd_oob_ops ops;
         int res;
 
         ops.mode = MTD_OOB_PLACE;
-        ops.ooboffs = offs & (mtd->writesize - 1);
+        ops.ooboffs = offs & mask;
         ops.ooblen = len;
         ops.oobbuf = buf;
         ops.datbuf = NULL;
 
-        res = mtd->write_oob(mtd, offs & ~(mtd->writesize - 1), &ops);
+        res = mtd->write_oob(mtd, offs & ~mask, &ops);
         *retlen = ops.oobretlen;
         return res;
 }
@@ -177,17 +179,18 @@ int nftl_write_oob(struct mtd_info *mtd, loff_t offs, size_t len,
 static int nftl_write(struct mtd_info *mtd, loff_t offs, size_t len,
                       size_t *retlen, uint8_t *buf, uint8_t *oob)
 {
+        loff_t mask = mtd->writesize - 1;
         struct mtd_oob_ops ops;
         int res;
 
         ops.mode = MTD_OOB_PLACE;
-        ops.ooboffs = offs & (mtd->writesize - 1);
+        ops.ooboffs = offs & mask;
         ops.ooblen = mtd->oobsize;
         ops.oobbuf = oob;
         ops.datbuf = buf;
         ops.len = len;
 
-        res = mtd->write_oob(mtd, offs & ~(mtd->writesize - 1), &ops);
+        res = mtd->write_oob(mtd, offs & ~mask, &ops);
         *retlen = ops.retlen;
         return res;
 }