target/linux/generic/backport-4.14/040-v4.17-0002-mtd-get-rid-of-the-mtd_add_device_partitions.patch

   1 From 0dbe4ea78d69756efeb0bba0764f6bd4a9ee9567 Mon Sep 17 00:00:00 2001
   2 From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
   3 Date: Tue, 16 Jan 2018 16:45:42 +0100
   4 Subject: [PATCH] mtd: get rid of the mtd_add_device_partitions()
   5 MIME-Version: 1.0
   6 Content-Type: text/plain; charset=UTF-8
   7 Content-Transfer-Encoding: 8bit
   8
   9 This simplifies code a bit by:
  10 1) Avoiding an extra (tiny) function
  11 2) Checking for amount of parsed (found) partitions just once
  12 3) Avoiding clearing/filling struct mtd_partitions manually
  13
  14 With this commit proper functions are called directly from the
  15 mtd_device_parse_register(). It doesn't need to use minor tricks like
  16 memsetting struct to 0 to trigger an expected
  17 mtd_add_device_partitions() behavior.
  18
  19 Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
  20 Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
  21 ---
  22  drivers/mtd/mtdcore.c | 43 ++++++++++++-------------------------------
  23  1 file changed, 12 insertions(+), 31 deletions(-)
  24
  25 --- a/drivers/mtd/mtdcore.c
  26 +++ b/drivers/mtd/mtdcore.c
  27 @@ -636,21 +636,6 @@ out_error:
  28         return ret;
  29  }
  30
  31 -static int mtd_add_device_partitions(struct mtd_info *mtd,
  32 -                                    struct mtd_partitions *parts)
  33 -{
  34 -       const struct mtd_partition *real_parts = parts->parts;
  35 -       int nbparts = parts->nr_parts;
  36 -
  37 -       if (!nbparts && !device_is_registered(&mtd->dev))
  38 -               return add_mtd_device(mtd);
  39 -
  40 -       if (nbparts > 0)
  41 -               return add_mtd_partitions(mtd, real_parts, nbparts);
  42 -
  43 -       return 0;
  44 -}
  45 -
  46  /*
  47   * Set a few defaults based on the parent devices, if not provided by the
  48   * driver
  49 @@ -701,7 +686,7 @@ int mtd_device_parse_register(struct mtd
  50                               const struct mtd_partition *parts,
  51                               int nr_parts)
  52  {
  53 -       struct mtd_partitions parsed;
  54 +       struct mtd_partitions parsed = { };
  55         int ret;
  56
  57         mtd_set_dev_defaults(mtd);
  58 @@ -712,24 +697,20 @@ int mtd_device_parse_register(struct mtd
  59                         return ret;
  60         }
  61
  62 -       memset(&parsed, 0, sizeof(parsed));
  63 -
  64 +       /* Prefer parsed partitions over driver-provided fallback */
  65         ret = parse_mtd_partitions(mtd, types, &parsed, parser_data);
  66 -       if ((ret < 0 || parsed.nr_parts == 0) && parts && nr_parts) {
  67 -               /* Fall back to driver-provided partitions */
  68 -               parsed = (struct mtd_partitions){
  69 -                       .parts          = parts,
  70 -                       .nr_parts       = nr_parts,
  71 -               };
  72 -       } else if (ret < 0) {
  73 -               /* Didn't come up with parsed OR fallback partitions */
  74 -               pr_info("mtd: failed to find partitions; one or more parsers reports errors (%d)\n",
  75 -                       ret);
  76 -               /* Don't abort on errors; we can still use unpartitioned MTD */
  77 -               memset(&parsed, 0, sizeof(parsed));
  78 +       if (!ret && parsed.nr_parts) {
  79 +               parts = parsed.parts;
  80 +               nr_parts = parsed.nr_parts;
  81         }
  82
  83 -       ret = mtd_add_device_partitions(mtd, &parsed);
  84 +       if (nr_parts)
  85 +               ret = add_mtd_partitions(mtd, parts, nr_parts);
  86 +       else if (!device_is_registered(&mtd->dev))
  87 +               ret = add_mtd_device(mtd);
  88 +       else
  89 +               ret = 0;
  90 +
  91         if (ret)
  92                 goto out;
  93