target/linux/bcm53xx/patches-5.10/140-mtd-parsers-trx-parse-firmware-MTD-partitions-only.patch

   1 From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
   2 Date: Tue, 13 Apr 2021 18:25:20 +0200
   3 Subject: [PATCH] mtd: parsers: trx: parse "firmware" MTD partitions only
   4 MIME-Version: 1.0
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   7
   8 Parsing every partition with "compatible" set to "brcm,trx" results in
   9 parsing both: firmware partition and failsafe partition on devices that
  10 implement failsafe booting. This affects e.g. Linksys EA9500 which has:
  11
  12 partition@200000 {
  13         reg = <0x0200000 0x01d00000>;
  14         compatible = "linksys,ns-firmware", "brcm,trx";
  15 };
  16
  17 partition@1f00000 {
  18         reg = <0x01f00000 0x01d00000>;
  19         compatible = "linksys,ns-firmware", "brcm,trx";
  20 };
  21
  22 Check for MTD partition name "firmware" before parsing. Recently added
  23 ofpart_linksys_ns.c creates "firmware" and "failsafe" depending on
  24 bootloader setup.
  25
  26 Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
  27 ---
  28  drivers/mtd/parsers/parser_trx.c | 4 ++++
  29  1 file changed, 4 insertions(+)
  30
  31 --- a/drivers/mtd/parsers/parser_trx.c
  32 +++ b/drivers/mtd/parsers/parser_trx.c
  33 @@ -85,6 +85,10 @@ static int parser_trx_parse(struct mtd_i
  34         uint8_t curr_part = 0, i = 0;
  35         int err;
  36
  37 +       /* Don't parse any failsafe / backup partitions */
  38 +       if (strcmp(mtd->name, "firmware"))
  39 +               return -EINVAL;
  40 +
  41         parts = kcalloc(TRX_PARSER_MAX_PARTS, sizeof(struct mtd_partition),
  42                         GFP_KERNEL);
  43         if (!parts)