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   1 From 40d12172c8a5c2f3fc39642fc564b053575cd000 Mon Sep 17 00:00:00 2001
   2 From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <zajec5@gmail.com>
   3 Date: Wed, 1 Apr 2015 08:23:05 +0200
   4 Subject: [PATCH] MIPS: BCM47XX: Don't try guessing NVRAM size on MTD partition
   5 MIME-Version: 1.0
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   7 Content-Transfer-Encoding: 8bit
   8
   9 When dealing with whole flash content (bcm47xx_nvram_init_from_mem) we
  10 need to find NVRAM start trying various partition sizes (nvram_sizes).
  11 This is not needed when using MTD as we have direct partition access.
  12
  13 Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
  14 Cc: linux-mips@linux-mips.org
  15 Cc: Hauke Mehrtens <hauke@hauke-m.de>
  16 Patchwork: https://patchwork.linux-mips.org/patch/9652/
  17 Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
  18 ---
  19  arch/mips/bcm47xx/nvram.c | 36 ++++++++++++++----------------------
  20  1 file changed, 14 insertions(+), 22 deletions(-)
  21
  22 --- a/arch/mips/bcm47xx/nvram.c
  23 +++ b/arch/mips/bcm47xx/nvram.c
  24 @@ -139,36 +139,28 @@ static int nvram_init(void)
  25         struct mtd_info *mtd;
  26         struct nvram_header header;
  27         size_t bytes_read;
  28 -       int err, i;
  29 +       int err;
  30
  31         mtd = get_mtd_device_nm("nvram");
  32         if (IS_ERR(mtd))
  33                 return -ENODEV;
  34
  35 -       for (i = 0; i < ARRAY_SIZE(nvram_sizes); i++) {
  36 -               loff_t from = mtd->size - nvram_sizes[i];
  37 -
  38 -               if (from < 0)
  39 -                       continue;
  40 +       err = mtd_read(mtd, 0, sizeof(header), &bytes_read, (uint8_t *)&header);
  41 +       if (!err && header.magic == NVRAM_MAGIC) {
  42 +               u8 *dst = (uint8_t *)nvram_buf;
  43 +               size_t len = header.len;
  44 +
  45 +               if (header.len > NVRAM_SPACE) {
  46 +                       pr_err("nvram on flash (%i bytes) is bigger than the reserved space in memory, will just copy the first %i bytes\n",
  47 +                               header.len, NVRAM_SPACE);
  48 +                       len = NVRAM_SPACE;
  49 +               }
  50
  51 -               err = mtd_read(mtd, from, sizeof(header), &bytes_read,
  52 -                              (uint8_t *)&header);
  53 -               if (!err && header.magic == NVRAM_MAGIC) {
  54 -                       u8 *dst = (uint8_t *)nvram_buf;
  55 -                       size_t len = header.len;
  56 -
  57 -                       if (header.len > NVRAM_SPACE) {
  58 -                               pr_err("nvram on flash (%i bytes) is bigger than the reserved space in memory, will just copy the first %i bytes\n",
  59 -                                      header.len, NVRAM_SPACE);
  60 -                               len = NVRAM_SPACE;
  61 -                       }
  62 -
  63 -                       err = mtd_read(mtd, from, len, &bytes_read, dst);
  64 -                       if (err)
  65 -                               return err;
  66 +               err = mtd_read(mtd, 0, len, &bytes_read, dst);
  67 +               if (err)
  68 +                       return err;
  69
  70 -                       return 0;
  71 -               }
  72 +               return 0;
  73         }
  74  #endif
  75