target/linux/generic/backport-5.4/410-mtd-fix-calculating-partition-end-address.patch

   1 From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
   2 Date: Mon, 9 Mar 2020 08:30:19 +0100
   3 Subject: [PATCH] mtd: fix calculating partition end address
   4 MIME-Version: 1.0
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   7
   8 This fixes check for partitions that don't start at beginning of their
   9 parents. Missing partition's offset in formula could result in forcing
  10 read-only incorrectly.
  11
  12 Fixes: 6750f61a13a0 ("mtd: improve calculating partition boundaries when checking for alignment")
  13 Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
  14 ---
  15  drivers/mtd/mtdpart.c | 2 +-
  16  1 file changed, 1 insertion(+), 1 deletion(-)
  17
  18 --- a/drivers/mtd/mtdpart.c
  19 +++ b/drivers/mtd/mtdpart.c
  20 @@ -524,7 +524,7 @@ static struct mtd_part *allocate_partiti
  21                         part->name);
  22         }
  23
  24 -       tmp = part_absolute_offset(parent) + slave->mtd.size;
  25 +       tmp = part_absolute_offset(parent) + slave->offset + slave->mtd.size;
  26         remainder = do_div(tmp, wr_alignment);
  27         if ((slave->mtd.flags & MTD_WRITEABLE) && remainder) {
  28                 slave->mtd.flags &= ~MTD_WRITEABLE;