target/linux/brcm47xx/patches-4.0/030-09-MIPS-BCM47XX-Don-t-try-guessing-NVRAM-size-on-MTD-pa.patch

   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
   6 Content-Type: text/plain; charset=UTF-8
   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 diff --git a/arch/mips/bcm47xx/nvram.c b/arch/mips/bcm47xx/nvram.c
  23 index 2ac7482..ba632ff 100644
  24 --- a/arch/mips/bcm47xx/nvram.c
  25 +++ b/arch/mips/bcm47xx/nvram.c
  26 @@ -139,36 +139,28 @@ static int nvram_init(void)
  27         struct mtd_info *mtd;
  28         struct nvram_header header;
  29         size_t bytes_read;
  30 -       int err, i;
  31 +       int err;
  32
  33         mtd = get_mtd_device_nm("nvram");
  34         if (IS_ERR(mtd))
  35                 return -ENODEV;
  36
  37 -       for (i = 0; i < ARRAY_SIZE(nvram_sizes); i++) {
  38 -               loff_t from = mtd->size - nvram_sizes[i];
  39 -
  40 -               if (from < 0)
  41 -                       continue;
  42 -
  43 -               err = mtd_read(mtd, from, sizeof(header), &bytes_read,
  44 -                              (uint8_t *)&header);
  45 -               if (!err && header.magic == NVRAM_MAGIC) {
  46 -                       u8 *dst = (uint8_t *)nvram_buf;
  47 -                       size_t len = header.len;
  48 +       err = mtd_read(mtd, 0, sizeof(header), &bytes_read, (uint8_t *)&header);
  49 +       if (!err && header.magic == NVRAM_MAGIC) {
  50 +               u8 *dst = (uint8_t *)nvram_buf;
  51 +               size_t len = header.len;
  52
  53 -                       if (header.len > NVRAM_SPACE) {
  54 -                               pr_err("nvram on flash (%i bytes) is bigger than the reserved space in memory, will just copy the first %i bytes\n",
  55 -                                      header.len, NVRAM_SPACE);
  56 -                               len = NVRAM_SPACE;
  57 -                       }
  58 +               if (header.len > NVRAM_SPACE) {
  59 +                       pr_err("nvram on flash (%i bytes) is bigger than the reserved space in memory, will just copy the first %i bytes\n",
  60 +                               header.len, NVRAM_SPACE);
  61 +                       len = NVRAM_SPACE;
  62 +               }
  63
  64 -                       err = mtd_read(mtd, from, len, &bytes_read, dst);
  65 -                       if (err)
  66 -                               return err;
  67 +               err = mtd_read(mtd, 0, len, &bytes_read, dst);
  68 +               if (err)
  69 +                       return err;
  70
  71 -                       return 0;
  72 -               }
  73 +               return 0;
  74         }
  75  #endif
  76
  77 --
  78 1.8.4.5
  79