linux-kernel - Re: [PATCH v2 1/6] mtd: spi-nor: change return value of read/write

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Date:	Tue, 4 Aug 2015 08:42:51 +0200
From:	Michal Suchanek <hramrach@...il.com>
To:	Marek Vasut <marex@...x.de>
Cc:	David Woodhouse <dwmw2@...radead.org>,
	Brian Norris <computersforpeace@...il.com>,
	Han Xu <han.xu@...escale.com>,
	Rafał Miłecki <zajec5@...il.com>,
	Huang Shijie <b32955@...escale.com>,
	Ben Hutchings <ben@...adent.org.uk>,
	Gabor Juhos <juhosg@...nwrt.org>,
	Bean Huo 霍斌斌 <beanhuo@...ron.com>,
	MTD Maling List <linux-mtd@...ts.infradead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Hou Zhiqiang <B48286@...escale.com>,
	Huang Shijie <shijie.huang@...el.com>
Subject: Re: [PATCH v2 1/6] mtd: spi-nor: change return value of read/write

On 3 August 2015 at 23:46, Marek Vasut <marex@...x.de> wrote:
> On Monday, August 03, 2015 at 08:39:01 PM, Michal Suchanek wrote:
>> 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.
>>
>> Signed-off-by: Michal Suchanek <hramrach@...il.com>
>> ---
>>  include/linux/mtd/spi-nor.h | 4 ++--
>>  1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/include/linux/mtd/spi-nor.h b/include/linux/mtd/spi-nor.h
>> index e540952..7d782cb 100644
>> --- a/include/linux/mtd/spi-nor.h
>> +++ b/include/linux/mtd/spi-nor.h
>> @@ -185,9 +185,9 @@ struct spi_nor {
>>       int (*write_reg)(struct spi_nor *nor, u8 opcode, u8 *buf, int len,
>>                       int write_enable);
>>
>> -     int (*read)(struct spi_nor *nor, loff_t from,
>> +     ssize_t (*read)(struct spi_nor *nor, loff_t from,
>>                       size_t len, size_t *retlen, u_char *read_buf);
>> -     void (*write)(struct spi_nor *nor, loff_t to,
>> +     ssize_t (*write)(struct spi_nor *nor, loff_t to,
>>                       size_t len, size_t *retlen, const u_char *write_buf);
>>       int (*erase)(struct spi_nor *nor, loff_t offs);
>
> You realize that if someone does bisect and has only this patch applied,
> the compiler will complain loudly about mismatching data types, right ? :)

Yes, the compiler prints a warning. However, only the return value
which is not used changes so it should not cause any real problem. The
data type in the fsl-quadspi and m25p80 drivers is matched in the
following two patches.

Thanks

Michal
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