target/linux/brcm47xx/patches-3.18/400-mtd-bcm47xxpart-lower-minimal-blocksize-to-4Ki-from-.patch

   1 From 4586bc54a322568d5258d6a1b04e361d4a95597b Mon Sep 17 00:00:00 2001
   2 From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <zajec5@gmail.com>
   3 Date: Wed, 12 Nov 2014 09:06:22 +0100
   4 Subject: [PATCH][RFC] mtd: bcm47xxpart: lower minimal blocksize to 4Ki (from
   5  64Ki)
   6 MIME-Version: 1.0
   7 Content-Type: text/plain; charset=UTF-8
   8 Content-Transfer-Encoding: 8bit
   9
  10 Some devices like Netgear WNR1000v3 or WGR614v10 have partitions aligned
  11 to 0x1000. Using bigger blocksize stopped us from detecting some parts.
  12
  13 Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
  14 ---
  15 Most of supported devices use flashes with erasesize 0x10000 (64Ki), so
  16 this change shouldn't affect them (no regressions expected).
  17 Any objections?
  18 ---
  19  drivers/mtd/bcm47xxpart.c | 8 ++++++--
  20  1 file changed, 6 insertions(+), 2 deletions(-)
  21
  22 --- a/drivers/mtd/bcm47xxpart.c
  23 +++ b/drivers/mtd/bcm47xxpart.c
  24 @@ -95,8 +95,12 @@ static int bcm47xxpart_parse(struct mtd_
  25         int possible_nvram_sizes[] = { 0x8000, 0xF000, 0x10000, };
  26         bool found_nvram = false;
  27
  28 -       if (blocksize <= 0x10000)
  29 -               blocksize = 0x10000;
  30 +       /*
  31 +        * Some really old flashes (like AT45DB*) had smaller erasesize-s, but
  32 +        * partitions were aligned to at least 0x1000 anyway.
  33 +        */
  34 +       if (blocksize < 0x1000)
  35 +               blocksize = 0x1000;
  36
  37         /* Alloc */
  38         parts = kzalloc(sizeof(struct mtd_partition) * BCM47XXPART_MAX_PARTS,