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| author | Michal Suchanek <hramrach@gmail.com> | 2016-05-05 17:31:55 -0700 |
|---|---|---|
| committer | Brian Norris <computersforpeace@gmail.com> | 2016-06-01 17:23:02 -0700 |
| commit | 26f9bcad29a6c240881bd4efc90f16a9990dd6c2 (patch) | |
| tree | 957d294b0b1c4ec2e56f686a8e99837fe7d20216 /drivers/mtd | |
| parent | e5d05cbd6d8b01f08c95c427a36c66aac769af4f (diff) | |
| download | linux-26f9bcad29a6c240881bd4efc90f16a9990dd6c2.tar.gz linux-26f9bcad29a6c240881bd4efc90f16a9990dd6c2.tar.bz2 linux-26f9bcad29a6c240881bd4efc90f16a9990dd6c2.zip | |
mtd: spi-nor: add read loop
mtdblock and ubi do not handle the situation when read returns less data
than requested. Loop in spi-nor until buffer is filled or an error is
returned.
Signed-off-by: Michal Suchanek <hramrach@gmail.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Tested-by Cyrille Pitchen <cyrille.pitchen@atmel.com>
Acked-by: Michal Suchanek <hramrach@gmail.com>
Tested-by: Michal Suchanek <hramrach@gmail.com>
Diffstat (limited to 'drivers/mtd')
| -rw-r--r-- | drivers/mtd/spi-nor/spi-nor.c | 25 |
1 files changed, 19 insertions, 6 deletions
diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c index fe55b48be5b3..a63922ed6385 100644 --- a/drivers/mtd/spi-nor/spi-nor.c +++ b/drivers/mtd/spi-nor/spi-nor.c @@ -1031,14 +1031,27 @@ static int spi_nor_read(struct mtd_info *mtd, loff_t from, size_t len, if (ret) return ret; - ret = nor->read(nor, from, len, buf); + while (len) { + ret = nor->read(nor, from, len, buf); + if (ret == 0) { + /* We shouldn't see 0-length reads */ + ret = -EIO; + goto read_err; + } + if (ret < 0) + goto read_err; - spi_nor_unlock_and_unprep(nor, SPI_NOR_OPS_READ); - if (ret < 0) - return ret; + WARN_ON(ret > len); + *retlen += ret; + buf += ret; + from += ret; + len -= ret; + } + ret = 0; - *retlen += ret; - return 0; +read_err: + spi_nor_unlock_and_unprep(nor, SPI_NOR_OPS_READ); + return ret; } static int sst_write(struct mtd_info *mtd, loff_t to, size_t len, |