linux-kernel - Re: [PATCH 9/13] drivers/media/tuners/fc0011.c: use macros for i2c

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Date:	Sun, 07 Oct 2012 18:43:51 +0200
From:	walter harms <wharms@....de>
To:	Julia Lawall <Julia.Lawall@...6.fr>
CC:	Michael Buesch <m@...s.ch>, kernel-janitors@...r.kernel.org,
	rmallon@...il.com, shubhrajyoti@...com,
	Mauro Carvalho Chehab <mchehab@...radead.org>,
	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 9/13] drivers/media/tuners/fc0011.c: use macros for i2c_msg
 initialization



Am 07.10.2012 17:38, schrieb Julia Lawall:
> From: Julia Lawall <Julia.Lawall@...6.fr>
> 
> Introduce use of I2c_MSG_READ/WRITE/OP, for readability.
> 
> A length expressed as an explicit constant is also re-expressed as the size
> of the buffer in each case.
> 
> A simplified version of the semantic patch that makes this change is as
> follows: (http://coccinelle.lip6.fr/)
> 
> // <smpl>
> @@
> expression a,b,c;
> identifier x;
> @@
> 
> struct i2c_msg x =
> - {.addr = a, .buf = b, .len = c, .flags = I2C_M_RD}
> + I2C_MSG_READ(a,b,c)
>  ;
> 
> @@
> expression a,b,c;
> identifier x;
> @@
> 
> struct i2c_msg x =
> - {.addr = a, .buf = b, .len = c, .flags = 0}
> + I2C_MSG_WRITE(a,b,c)
>  ;
> 
> @@
> expression a,b,c,d;
> identifier x;
> @@
> 
> struct i2c_msg x = 
> - {.addr = a, .buf = b, .len = c, .flags = d}
> + I2C_MSG_OP(a,b,c,d)
>  ;
> // </smpl>
> 
> Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>
> 
> ---
>  drivers/media/tuners/fc0011.c |    9 +++------
>  1 file changed, 3 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/media/tuners/fc0011.c b/drivers/media/tuners/fc0011.c
> index e488254..5dbba98 100644
> --- a/drivers/media/tuners/fc0011.c
> +++ b/drivers/media/tuners/fc0011.c
> @@ -80,8 +80,7 @@ struct fc0011_priv {
>  static int fc0011_writereg(struct fc0011_priv *priv, u8 reg, u8 val)
>  {
>  	u8 buf[2] = { reg, val };
> -	struct i2c_msg msg = { .addr = priv->addr,
> -		.flags = 0, .buf = buf, .len = 2 };
> +	struct i2c_msg msg = I2C_MSG_WRITE(priv->addr, buf, sizeof(buf));
>  
>  	if (i2c_transfer(priv->i2c, &msg, 1) != 1) {
>  		dev_err(&priv->i2c->dev,
> @@ -97,10 +96,8 @@ static int fc0011_readreg(struct fc0011_priv *priv, u8 reg, u8 *val)
>  {
>  	u8 dummy;
>  	struct i2c_msg msg[2] = {
> -		{ .addr = priv->addr,
> -		  .flags = 0, .buf = &reg, .len = 1 },
> -		{ .addr = priv->addr,
> -		  .flags = I2C_M_RD, .buf = val ? : &dummy, .len = 1 },
> +		I2C_MSG_WRITE(priv->addr, &reg, sizeof(reg)),
> +		I2C_MSG_READ(priv->addr, val ? : &dummy, sizeof(dummy)),
>  	};
>  

This dummy looks strange, can it be that this is used uninitialised ?

re,
 wh


>  	if (i2c_transfer(priv->i2c, msg, 2) != 2) {
> 
> --
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> 
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