linux-kernel - Re: [PATCH 2/2] regmap: spi: Support asynchronous I/O for SPI

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Date:	Mon, 28 Jan 2013 17:47:36 -0800
From:	Stephen Boyd <sboyd@...eaurora.org>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
CC:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] regmap: spi: Support asynchronous I/O for SPI

On 01/28/13 17:39, Mark Brown wrote:
> On Mon, Jan 28, 2013 at 11:38:50AM -0800, Stephen Boyd wrote:
>> On 01/27/13 06:12, Mark Brown wrote:
>>> +static int regmap_spi_async_write(void *context,
>>> +				  const void *reg, size_t reg_len,
>>> +				  const void *val, size_t val_len,
>>> +				  struct regmap_async *a)
>>> +{
>>> +	struct regmap_async_spi *async = (void *)a;
>> Can you use container_of() here?
> We could but I tend not to if the interface strictly requires that the
> pointers be type punnable.

What is the interface requiring strict type punning here? async_write?

I just hope we don't move the fields around in the regmap_async_spi
struct and then this code silently breaks. I hope the compiler is smart
enough to skip doing any math if we used container_of() with the current
struct layout.

-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
hosted by The Linux Foundation

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