target/linux/layerscape/patches-5.4/303-core-0008-ENGR00279980-ubi-attach-do-not-return-EINVAL-if-the-.patch

   1 From 17e6b7bb84649ffcbec11b3e3e933294d8856462 Mon Sep 17 00:00:00 2001
   2 From: Huang Shijie <b32955@freescale.com>
   3 Date: Wed, 18 Sep 2013 10:17:39 +0800
   4 Subject: [PATCH] ENGR00279980 ubi: attach: do not return -EINVAL if the
   5  mtd->numeraseregions is 1
   6
   7 If the master mtd does not have any slave mtd partitions,
   8 and its numeraseregions is one(only has one erease block), and
   9 we attach the master mtd with : ubiattach -m 0 -d 0
  10
  11 We will meet the error:
  12 -------------------------------------------------------
  13 root@freescale ~$ ubiattach /dev/ubi_ctrl -m 0 -d 0
  14 UBI: attaching mtd0 to ubi0
  15 UBI error: io_init: multiple regions, not implemented
  16 ubiattach: error!: cannot attach mtd0
  17            error 22 (Invalid argument)
  18 -------------------------------------------------------
  19
  20 In fact, if there is only one "erase block", we should not
  21 prevent the attach.
  22
  23 This patch fixes it.
  24
  25 Signed-off-by: Huang Shijie <b32955@freescale.com>
  26 (cherry picked from commit 361cdc47fc4c4db31c5485560cdabd94f409bd81)
  27 (cherry picked from commit ebee7d74914fad3cf7223af84496811c9d2488a1)
  28
  29 Signed-off-by: Vipul Kumar <vipul_kumar@mentor.com>
  30
  31 Signed-off-by: Han Xu <han.xu@nxp.com>
  32 ---
  33  drivers/mtd/ubi/build.c | 2 +-
  34  1 file changed, 1 insertion(+), 1 deletion(-)
  35
  36 --- a/drivers/mtd/ubi/build.c
  37 +++ b/drivers/mtd/ubi/build.c
  38 @@ -576,7 +576,7 @@ static int io_init(struct ubi_device *ub
  39         dbg_gen("sizeof(struct ubi_ainf_peb) %zu", sizeof(struct ubi_ainf_peb));
  40         dbg_gen("sizeof(struct ubi_wl_entry) %zu", sizeof(struct ubi_wl_entry));
  41
  42 -       if (ubi->mtd->numeraseregions != 0) {
  43 +       if (ubi->mtd->numeraseregions > 1) {
  44                 /*
  45                  * Some flashes have several erase regions. Different regions
  46                  * may have different eraseblock size and other