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mtd: spi-nor: change return value of read/write

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Change the return value of spi-nor device read and write methods to
allow returning amount of data transferred and errors as
read(2)/write(2) does.

Also, start handling positive returns in spi_nor_read(), since we want
to convert drivers to start returning the read-length both via *retlen
and the return code. (We don't need to do the same transition process
for spi_nor_write(), since ->write() didn't used to have a return code
at all.)

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>
This commit is contained in:
Michal Suchanek
2016-05-05 17:31:47 -07:00
committed by Brian Norris
parent becc7ae544
commit 59451e1233
6 changed files with 36 additions and 21 deletions
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5
drivers/mtd/spi-nor/spi-nor.c
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@@ -1034,7 +1034,10 @@ static int spi_nor_read(struct mtd_info *mtd, loff_t from, size_t len,
ret = nor->read(nor, from, len, retlen, buf);
spi_nor_unlock_and_unprep(nor, SPI_NOR_OPS_READ);
return ret;
if (ret < 0)
return ret;
return 0;
}
static int sst_write(struct mtd_info *mtd, loff_t to, size_t len,