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| author | Michal Suchanek <hramrach@gmail.com> | 2016-05-06 03:31:48 +0300 |
|---|---|---|
| committer | Brian Norris <computersforpeace@gmail.com> | 2016-06-02 03:22:37 +0300 |
| commit | 1992297b0810a42d78ec7b4de15304eb0489fd97 (patch) | |
| tree | 6323c58c98f20094c182e5457a5a967ce8b90852 /drivers/mtd/devices | |
| parent | 59451e1233bd315c5379a631838a03d80e689581 (diff) | |
| download | linux-1992297b0810a42d78ec7b4de15304eb0489fd97.tar.xz | |
mtd: m25p80: return amount of data transferred or error in read/write
Add checking of SPI transfer errors and return them from read/write
functions. Also return the amount of data transferred.
Signed-off-by: Michal Suchanek <hramrach@gmail.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Acked-by: Michal Suchanek <hramrach@gmail.com>
Tested-by: Michal Suchanek <hramrach@gmail.com>
Diffstat (limited to 'drivers/mtd/devices')
| -rw-r--r-- | drivers/mtd/devices/m25p80.c | 29 |
1 files changed, 21 insertions, 8 deletions
diff --git a/drivers/mtd/devices/m25p80.c b/drivers/mtd/devices/m25p80.c index 3bd75e87ed89..2ef5a6015276 100644 --- a/drivers/mtd/devices/m25p80.c +++ b/drivers/mtd/devices/m25p80.c @@ -81,6 +81,7 @@ static ssize_t m25p80_write(struct spi_nor *nor, loff_t to, size_t len, struct spi_transfer t[2] = {}; struct spi_message m; int cmd_sz = m25p_cmdsz(nor); + ssize_t ret; spi_message_init(&m); @@ -98,10 +99,15 @@ static ssize_t m25p80_write(struct spi_nor *nor, loff_t to, size_t len, t[1].len = len; spi_message_add_tail(&t[1], &m); - spi_sync(spi, &m); + ret = spi_sync(spi, &m); + if (ret) + return ret; - *retlen += m.actual_length - cmd_sz; - return 0; + ret = m.actual_length - cmd_sz; + if (ret < 0) + return -EIO; + *retlen += ret; + return ret; } static inline unsigned int m25p80_rx_nbits(struct spi_nor *nor) @@ -128,13 +134,13 @@ static ssize_t m25p80_read(struct spi_nor *nor, loff_t from, size_t len, struct spi_transfer t[2]; struct spi_message m; unsigned int dummy = nor->read_dummy; + ssize_t ret; /* convert the dummy cycles to the number of bytes */ dummy /= 8; if (spi_flash_read_supported(spi)) { struct spi_flash_read_message msg; - int ret; memset(&msg, 0, sizeof(msg)); @@ -151,7 +157,9 @@ static ssize_t m25p80_read(struct spi_nor *nor, loff_t from, size_t len, ret = spi_flash_read(spi, &msg); *retlen = msg.retlen; - return ret; + if (ret < 0) + return ret; + return msg.retlen; } spi_message_init(&m); @@ -169,10 +177,15 @@ static ssize_t m25p80_read(struct spi_nor *nor, loff_t from, size_t len, t[1].len = len; spi_message_add_tail(&t[1], &m); - spi_sync(spi, &m); + ret = spi_sync(spi, &m); + if (ret) + return ret; - *retlen = m.actual_length - m25p_cmdsz(nor) - dummy; - return 0; + ret = m.actual_length - m25p_cmdsz(nor) - dummy; + if (ret < 0) + return -EIO; + *retlen += ret; + return ret; } /* |