target/linux/generic/patches-3.18/041-mtd-bcm47xxpart-backports-from-3.20.patch

   1 --- a/drivers/mtd/bcm47xxpart.c
   2 +++ b/drivers/mtd/bcm47xxpart.c
   3 @@ -15,6 +15,8 @@
   4  #include <linux/mtd/mtd.h>
   5  #include <linux/mtd/partitions.h>
   6
   7 +#include <uapi/linux/magic.h>
   8 +
   9  /*
  10   * NAND flash on Netgear R6250 was verified to contain 15 partitions.
  11   * This will result in allocating too big array for some old devices, but the
  12 @@ -39,7 +41,8 @@
  13  #define ML_MAGIC1                      0x39685a42
  14  #define ML_MAGIC2                      0x26594131
  15  #define TRX_MAGIC                      0x30524448
  16 -#define SQSH_MAGIC                     0x71736873      /* shsq */
  17 +#define SHSQ_MAGIC                     0x71736873      /* shsq (weird ZTE H218N endianness) */
  18 +#define UBI_EC_MAGIC                   0x23494255      /* UBI# */
  19
  20  struct trx_header {
  21         uint32_t magic;
  22 @@ -50,7 +53,7 @@ struct trx_header {
  23         uint32_t offset[3];
  24  } __packed;
  25
  26 -static void bcm47xxpart_add_part(struct mtd_partition *part, char *name,
  27 +static void bcm47xxpart_add_part(struct mtd_partition *part, const char *name,
  28                                  u64 offset, uint32_t mask_flags)
  29  {
  30         part->name = name;
  31 @@ -58,6 +61,26 @@ static void bcm47xxpart_add_part(struct
  32         part->mask_flags = mask_flags;
  33  }
  34
  35 +static const char *bcm47xxpart_trx_data_part_name(struct mtd_info *master,
  36 +                                                 size_t offset)
  37 +{
  38 +       uint32_t buf;
  39 +       size_t bytes_read;
  40 +
  41 +       if (mtd_read(master, offset, sizeof(buf), &bytes_read,
  42 +                    (uint8_t *)&buf) < 0) {
  43 +               pr_err("mtd_read error while parsing (offset: 0x%X)!\n",
  44 +                       offset);
  45 +               goto out_default;
  46 +       }
  47 +
  48 +       if (buf == UBI_EC_MAGIC)
  49 +               return "ubi";
  50 +
  51 +out_default:
  52 +       return "rootfs";
  53 +}
  54 +
  55  static int bcm47xxpart_parse(struct mtd_info *master,
  56                              struct mtd_partition **pparts,
  57                              struct mtd_part_parser_data *data)
  58 @@ -73,8 +96,12 @@ static int bcm47xxpart_parse(struct mtd_
  59         int last_trx_part = -1;
  60         int possible_nvram_sizes[] = { 0x8000, 0xF000, 0x10000, };
  61
  62 -       if (blocksize <= 0x10000)
  63 -               blocksize = 0x10000;
  64 +       /*
  65 +        * Some really old flashes (like AT45DB*) had smaller erasesize-s, but
  66 +        * partitions were aligned to at least 0x1000 anyway.
  67 +        */
  68 +       if (blocksize < 0x1000)
  69 +               blocksize = 0x1000;
  70
  71         /* Alloc */
  72         parts = kzalloc(sizeof(struct mtd_partition) * BCM47XXPART_MAX_PARTS,
  73 @@ -186,8 +213,11 @@ static int bcm47xxpart_parse(struct mtd_
  74                          * we want to have jffs2 (overlay) in the same mtd.
  75                          */
  76                         if (trx->offset[i]) {
  77 +                               const char *name;
  78 +
  79 +                               name = bcm47xxpart_trx_data_part_name(master, offset + trx->offset[i]);
  80                                 bcm47xxpart_add_part(&parts[curr_part++],
  81 -                                                    "rootfs",
  82 +                                                    name,
  83                                                      offset + trx->offset[i],
  84                                                      0);
  85                                 i++;
  86 @@ -203,7 +233,8 @@ static int bcm47xxpart_parse(struct mtd_
  87                 }
  88
  89                 /* Squashfs on devices not using TRX */
  90 -               if (buf[0x000 / 4] == SQSH_MAGIC) {
  91 +               if (le32_to_cpu(buf[0x000 / 4]) == SQUASHFS_MAGIC ||
  92 +                   buf[0x000 / 4] == SHSQ_MAGIC) {
  93                         bcm47xxpart_add_part(&parts[curr_part++], "rootfs",
  94                                              offset, 0);
  95                         continue;