releases/4.15.17/mtd-mtd_oobtest-handle-bitflips-during-reads.patch

   1 From foo@baz Mon Apr  9 10:16:32 CEST 2018
   2 From: Miquel Raynal <miquel.raynal@free-electrons.com>
   3 Date: Thu, 11 Jan 2018 21:39:20 +0100
   4 Subject: mtd: mtd_oobtest: Handle bitflips during reads
   5
   6 From: Miquel Raynal <miquel.raynal@free-electrons.com>
   7
   8
   9 [ Upstream commit 12663b442e5ac5aa3d6097cd3f287c71ba46d26e ]
  10
  11 Reads from NAND devices usually trigger bitflips, this is an expected
  12 behavior. While bitflips are under a given threshold, the MTD core
  13 returns 0. However, when the number of corrected bitflips is above this
  14 same threshold, -EUCLEAN is returned to inform the upper layer that this
  15 block is slightly dying and soon the ECC engine will be overtaken so
  16 actions should be taken to move the data out of it.
  17
  18 This particular condition should not be treated like an error and the
  19 test should continue.
  20
  21 Signed-off-by: Miquel Raynal <miquel.raynal@free-electrons.com>
  22 Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
  23 Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
  24 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
  25 ---
  26  drivers/mtd/tests/oobtest.c |   21 +++++++++++++++++++++
  27  1 file changed, 21 insertions(+)
  28
  29 --- a/drivers/mtd/tests/oobtest.c
  30 +++ b/drivers/mtd/tests/oobtest.c
  31 @@ -193,6 +193,9 @@ static int verify_eraseblock(int ebnum)
  32                 ops.datbuf    = NULL;
  33                 ops.oobbuf    = readbuf;
  34                 err = mtd_read_oob(mtd, addr, &ops);
  35 +               if (mtd_is_bitflip(err))
  36 +                       err = 0;
  37 +
  38                 if (err || ops.oobretlen != use_len) {
  39                         pr_err("error: readoob failed at %#llx\n",
  40                                (long long)addr);
  41 @@ -227,6 +230,9 @@ static int verify_eraseblock(int ebnum)
  42                         ops.datbuf    = NULL;
  43                         ops.oobbuf    = readbuf;
  44                         err = mtd_read_oob(mtd, addr, &ops);
  45 +                       if (mtd_is_bitflip(err))
  46 +                               err = 0;
  47 +
  48                         if (err || ops.oobretlen != mtd->oobavail) {
  49                                 pr_err("error: readoob failed at %#llx\n",
  50                                                 (long long)addr);
  51 @@ -286,6 +292,9 @@ static int verify_eraseblock_in_one_go(i
  52
  53         /* read entire block's OOB at one go */
  54         err = mtd_read_oob(mtd, addr, &ops);
  55 +       if (mtd_is_bitflip(err))
  56 +               err = 0;
  57 +
  58         if (err || ops.oobretlen != len) {
  59                 pr_err("error: readoob failed at %#llx\n",
  60                        (long long)addr);
  61 @@ -527,6 +536,9 @@ static int __init mtd_oobtest_init(void)
  62         pr_info("attempting to start read past end of OOB\n");
  63         pr_info("an error is expected...\n");
  64         err = mtd_read_oob(mtd, addr0, &ops);
  65 +       if (mtd_is_bitflip(err))
  66 +               err = 0;
  67 +
  68         if (err) {
  69                 pr_info("error occurred as expected\n");
  70                 err = 0;
  71 @@ -571,6 +583,9 @@ static int __init mtd_oobtest_init(void)
  72                 pr_info("attempting to read past end of device\n");
  73                 pr_info("an error is expected...\n");
  74                 err = mtd_read_oob(mtd, mtd->size - mtd->writesize, &ops);
  75 +               if (mtd_is_bitflip(err))
  76 +                       err = 0;
  77 +
  78                 if (err) {
  79                         pr_info("error occurred as expected\n");
  80                         err = 0;
  81 @@ -615,6 +630,9 @@ static int __init mtd_oobtest_init(void)
  82                 pr_info("attempting to read past end of device\n");
  83                 pr_info("an error is expected...\n");
  84                 err = mtd_read_oob(mtd, mtd->size - mtd->writesize, &ops);
  85 +               if (mtd_is_bitflip(err))
  86 +                       err = 0;
  87 +
  88                 if (err) {
  89                         pr_info("error occurred as expected\n");
  90                         err = 0;
  91 @@ -684,6 +702,9 @@ static int __init mtd_oobtest_init(void)
  92                 ops.datbuf    = NULL;
  93                 ops.oobbuf    = readbuf;
  94                 err = mtd_read_oob(mtd, addr, &ops);
  95 +               if (mtd_is_bitflip(err))
  96 +                       err = 0;
  97 +
  98                 if (err)
  99                         goto out;
 100                 if (memcmpshow(addr, readbuf, writebuf,