linux-kernel - Re: [PATCH 1/3] mtd: devices: m25p80: Simplify m25p80

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Date:   Tue, 2 Apr 2019 12:06:36 +0530
From:   Vignesh Raghavendra <vigneshr@...com>
To:     Andrey Smirnov <andrew.smirnov@...il.com>,
        <linux-mtd@...ts.infradead.org>
CC:     Marek Vasut <marek.vasut@...il.com>,
        <linux-kernel@...r.kernel.org>,
        Boris Brezillon <boris.brezillon@...tlin.com>,
        Brian Norris <computersforpeace@...il.com>,
        Chris Healy <cphealy@...il.com>
Subject: Re: [PATCH 1/3] mtd: devices: m25p80: Simplify m25p80_read()

Hi,

On 01/04/19 10:19 AM, Andrey Smirnov wrote:
> Spi_nor_read() already has an appropriate loop around .read() callback
> to handle the case when not all of the data requested was written in a
> signle ->read() call. Drop extra code doing the same thing in
> m25p80_read().
> 

Thanks for the patch series! But we are in the process of completely
moving m25p80.c into spi-nor.c which should take care of this series.
See[1][2], I plan to post the next version shortly. Let me know if
something is missing.

[1] https://patchwork.ozlabs.org/patch/982925/
[2] https://patchwork.ozlabs.org/patch/982922/

Regards
Vignesh

> Signed-off-by: Andrey Smirnov <andrew.smirnov@...il.com>
> Cc: Brian Norris <computersforpeace@...il.com>
> Cc: Boris Brezillon <boris.brezillon@...tlin.com>
> Cc: Marek Vasut <marek.vasut@...il.com>
> Cc: Chris Healy <cphealy@...il.com>
> Cc: linux-mtd@...ts.infradead.org
> Cc: linux-kernel@...r.kernel.org
> ---
>  drivers/mtd/devices/m25p80.c | 22 +++++++---------------
>  1 file changed, 7 insertions(+), 15 deletions(-)
> 
> diff --git a/drivers/mtd/devices/m25p80.c b/drivers/mtd/devices/m25p80.c
> index 651bab6d4e31..114f8ccea85b 100644
> --- a/drivers/mtd/devices/m25p80.c
> +++ b/drivers/mtd/devices/m25p80.c
> @@ -125,7 +125,6 @@ static ssize_t m25p80_read(struct spi_nor *nor, loff_t from, size_t len,
>  				   SPI_MEM_OP_ADDR(nor->addr_width, from, 1),
>  				   SPI_MEM_OP_DUMMY(nor->read_dummy, 1),
>  				   SPI_MEM_OP_DATA_IN(len, buf, 1));
> -	size_t remaining = len;
>  	int ret;
>  
>  	/* get transfer protocols. */
> @@ -137,22 +136,15 @@ static ssize_t m25p80_read(struct spi_nor *nor, loff_t from, size_t len,
>  	/* convert the dummy cycles to the number of bytes */
>  	op.dummy.nbytes = (nor->read_dummy * op.dummy.buswidth) / 8;
>  
> -	while (remaining) {
> -		op.data.nbytes = remaining < UINT_MAX ? remaining : UINT_MAX;
> -		ret = spi_mem_adjust_op_size(flash->spimem, &op);
> -		if (ret)
> -			return ret;
> -
> -		ret = spi_mem_exec_op(flash->spimem, &op);
> -		if (ret)
> -			return ret;
> +	ret = spi_mem_adjust_op_size(flash->spimem, &op);
> +	if (ret)
> +		return ret;
>  
> -		op.addr.val += op.data.nbytes;
> -		remaining -= op.data.nbytes;
> -		op.data.buf.in += op.data.nbytes;
> -	}
> +	ret = spi_mem_exec_op(flash->spimem, &op);
> +	if (ret)
> +		return ret;
>  
> -	return len;
> +	return op.data.nbytes;
>  }
>  
>  /*
> 

-- 
Regards
Vignesh