target/linux/brcm63xx/patches-4.4/000-4.8-02-mtd-m25p80-return-amount-of-data-transferred-or-erro.patch

   1 From 1992297b0810a42d78ec7b4de15304eb0489fd97 Mon Sep 17 00:00:00 2001
   2 From: Michal Suchanek <hramrach@gmail.com>
   3 Date: Thu, 5 May 2016 17:31:48 -0700
   4 Subject: [PATCH 02/10] mtd: m25p80: return amount of data transferred or error
   5  in read/write
   6
   7 Add checking of SPI transfer errors and return them from read/write
   8 functions. Also return the amount of data transferred.
   9
  10 Signed-off-by: Michal Suchanek <hramrach@gmail.com>
  11 Signed-off-by: Brian Norris <computersforpeace@gmail.com>
  12 Acked-by: Michal Suchanek <hramrach@gmail.com>
  13 Tested-by: Michal Suchanek <hramrach@gmail.com>
  14 ---
  15  drivers/mtd/devices/m25p80.c | 29 +++++++++++++++++++++--------
  16  1 file changed, 21 insertions(+), 8 deletions(-)
  17
  18 --- a/drivers/mtd/devices/m25p80.c
  19 +++ b/drivers/mtd/devices/m25p80.c
  20 @@ -81,6 +81,7 @@ static ssize_t m25p80_write(struct spi_n
  21         struct spi_transfer t[2] = {};
  22         struct spi_message m;
  23         int cmd_sz = m25p_cmdsz(nor);
  24 +       ssize_t ret;
  25
  26         spi_message_init(&m);
  27
  28 @@ -98,10 +99,15 @@ static ssize_t m25p80_write(struct spi_n
  29         t[1].len = len;
  30         spi_message_add_tail(&t[1], &m);
  31
  32 -       spi_sync(spi, &m);
  33 +       ret = spi_sync(spi, &m);
  34 +       if (ret)
  35 +               return ret;
  36
  37 -       *retlen += m.actual_length - cmd_sz;
  38 -       return 0;
  39 +       ret = m.actual_length - cmd_sz;
  40 +       if (ret < 0)
  41 +               return -EIO;
  42 +       *retlen += ret;
  43 +       return ret;
  44  }
  45
  46  static inline unsigned int m25p80_rx_nbits(struct spi_nor *nor)
  47 @@ -128,13 +134,13 @@ static ssize_t m25p80_read(struct spi_no
  48         struct spi_transfer t[2];
  49         struct spi_message m;
  50         unsigned int dummy = nor->read_dummy;
  51 +       ssize_t ret;
  52
  53         /* convert the dummy cycles to the number of bytes */
  54         dummy /= 8;
  55
  56         if (spi_flash_read_supported(spi)) {
  57                 struct spi_flash_read_message msg;
  58 -               int ret;
  59
  60                 memset(&msg, 0, sizeof(msg));
  61
  62 @@ -151,7 +157,9 @@ static ssize_t m25p80_read(struct spi_no
  63
  64                 ret = spi_flash_read(spi, &msg);
  65                 *retlen = msg.retlen;
  66 -               return ret;
  67 +               if (ret < 0)
  68 +                       return ret;
  69 +               return msg.retlen;
  70         }
  71
  72         spi_message_init(&m);
  73 @@ -169,10 +177,15 @@ static ssize_t m25p80_read(struct spi_no
  74         t[1].len = len;
  75         spi_message_add_tail(&t[1], &m);
  76
  77 -       spi_sync(spi, &m);
  78 +       ret = spi_sync(spi, &m);
  79 +       if (ret)
  80 +               return ret;
  81
  82 -       *retlen = m.actual_length - m25p_cmdsz(nor) - dummy;
  83 -       return 0;
  84 +       ret = m.actual_length - m25p_cmdsz(nor) - dummy;
  85 +       if (ret < 0)
  86 +               return -EIO;
  87 +       *retlen += ret;
  88 +       return ret;
  89  }
  90
  91  static int m25p80_erase(struct spi_nor *nor, loff_t offset)