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59451e1233
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>