linux-kernel - Re: [PATCH 1/7] rtc: Convert struct i2c

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Message-ID: <50581061.4040402@gmail.com>
Date:	Tue, 18 Sep 2012 16:10:41 +1000
From:	Ryan Mallon <rmallon@...il.com>
To:	Shubhrajyoti <shubhrajyoti@...com>
CC:	rtc-linux@...glegroups.com, linux-kernel@...r.kernel.org,
	julia.lawall@...6.fr
Subject: Re: [PATCH 1/7] rtc: Convert struct i2c_msg initialization to C99
 format

On 18/09/12 16:05, Shubhrajyoti wrote:
> On Tuesday 18 September 2012 07:14 AM, Ryan Mallon wrote:
>> On 17/09/12 23:58, Shubhrajyoti D wrote:
>>>     Convert the struct i2c_msg initialization to C99 format. This makes
>>>     maintaining and editing the code simpler. Also helps once other fields
>>>     like transferred are added in future.
>>>
>>> Signed-off-by: Shubhrajyoti D <shubhrajyoti@...com>
>>> ---
>>>  drivers/rtc/rtc-ds1672.c |   26 ++++++++++++++++++++++----
>>>  1 files changed, 22 insertions(+), 4 deletions(-)
>>>
>>> diff --git a/drivers/rtc/rtc-ds1672.c b/drivers/rtc/rtc-ds1672.c
>>> index 7fa67d0..b44b2a1 100644
>>> --- a/drivers/rtc/rtc-ds1672.c
>>> +++ b/drivers/rtc/rtc-ds1672.c
>>> @@ -37,8 +37,18 @@ static int ds1672_get_datetime(struct i2c_client *client, struct rtc_time *tm)
>>>  	unsigned char buf[4];
>>>  
>>>  	struct i2c_msg msgs[] = {
>>> -		{client->addr, 0, 1, &addr},	/* setup read ptr */
>>> -		{client->addr, I2C_M_RD, 4, buf},	/* read date */
>>> +		{
>>> +			.addr = client->addr,
>>> +			.flags = 0,
>>> +			.len = 1,
>>> +			.buf = &addr
>>> +		},	/* setup read ptr */
>> It would be nice to tabify the fields, and put the comments on their own
>> lines while you are here. With the C99 format you can also omit fields
>> which are initialised to zero. Like this:
> For local structures also?

Yes, C99 initialisers automatically clear all unspecified fields to
zero. See:
http://stackoverflow.com/questions/3374446/what-happens-to-fields-not-named-by-a-designated-initializer

~Ryan

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