target/linux/generic/backport-4.9/063-v4.11-0002-mtd-introduce-function-max_bad_blocks.patch

   1 From 6080ef6e7c0a0592cbcca11200d879faf65e27d4 Mon Sep 17 00:00:00 2001
   2 From: Jeff Westfahl <jeff.westfahl@ni.com>
   3 Date: Tue, 10 Jan 2017 13:30:17 -0600
   4 Subject: [PATCH] mtd: introduce function max_bad_blocks
   5
   6 If implemented, 'max_bad_blocks' returns the maximum number of bad
   7 blocks to reserve for a MTD. An implementation for NAND is coming soon.
   8
   9 Signed-off-by: Jeff Westfahl <jeff.westfahl@ni.com>
  10 Signed-off-by: Zach Brown <zach.brown@ni.com>
  11 Acked-by: Boris Brezillon <boris.brezillon@free-electron.com>
  12 Acked-by: Brian Norris <computersforpeace@gmail.com>
  13 Signed-off-by: Brian Norris <computersforpeace@gmail.com>
  14 ---
  15  drivers/mtd/mtdpart.c   | 10 ++++++++++
  16  include/linux/mtd/mtd.h | 13 +++++++++++++
  17  2 files changed, 23 insertions(+)
  18
  19 --- a/drivers/mtd/mtdpart.c
  20 +++ b/drivers/mtd/mtdpart.c
  21 @@ -349,6 +349,14 @@ static const struct mtd_ooblayout_ops pa
  22         .free = part_ooblayout_free,
  23  };
  24
  25 +static int part_max_bad_blocks(struct mtd_info *mtd, loff_t ofs, size_t len)
  26 +{
  27 +       struct mtd_part *part = mtd_to_part(mtd);
  28 +
  29 +       return part->master->_max_bad_blocks(part->master,
  30 +                                            ofs + part->offset, len);
  31 +}
  32 +
  33  static inline void free_partition(struct mtd_part *p)
  34  {
  35         kfree(p->mtd.name);
  36 @@ -475,6 +483,8 @@ static struct mtd_part *allocate_partiti
  37                 slave->mtd._block_isbad = part_block_isbad;
  38         if (master->_block_markbad)
  39                 slave->mtd._block_markbad = part_block_markbad;
  40 +       if (master->_max_bad_blocks)
  41 +               slave->mtd._max_bad_blocks = part_max_bad_blocks;
  42
  43         if (master->_get_device)
  44                 slave->mtd._get_device = part_get_device;
  45 --- a/include/linux/mtd/mtd.h
  46 +++ b/include/linux/mtd/mtd.h
  47 @@ -322,6 +322,7 @@ struct mtd_info {
  48         int (*_block_isreserved) (struct mtd_info *mtd, loff_t ofs);
  49         int (*_block_isbad) (struct mtd_info *mtd, loff_t ofs);
  50         int (*_block_markbad) (struct mtd_info *mtd, loff_t ofs);
  51 +       int (*_max_bad_blocks) (struct mtd_info *mtd, loff_t ofs, size_t len);
  52         int (*_suspend) (struct mtd_info *mtd);
  53         void (*_resume) (struct mtd_info *mtd);
  54         void (*_reboot) (struct mtd_info *mtd);
  55 @@ -397,6 +398,18 @@ static inline int mtd_oobavail(struct mt
  56         return ops->mode == MTD_OPS_AUTO_OOB ? mtd->oobavail : mtd->oobsize;
  57  }
  58
  59 +static inline int mtd_max_bad_blocks(struct mtd_info *mtd,
  60 +                                    loff_t ofs, size_t len)
  61 +{
  62 +       if (!mtd->_max_bad_blocks)
  63 +               return -ENOTSUPP;
  64 +
  65 +       if (mtd->size < (len + ofs) || ofs < 0)
  66 +               return -EINVAL;
  67 +
  68 +       return mtd->_max_bad_blocks(mtd, ofs, len);
  69 +}
  70 +
  71  int mtd_wunit_to_pairing_info(struct mtd_info *mtd, int wunit,
  72                               struct mtd_pairing_info *info);
  73  int mtd_pairing_info_to_wunit(struct mtd_info *mtd,