linux-kernel - Re: [PATCH 08/23] cx25840: Replace memcpy with struct assignment

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Date:	Tue, 23 Oct 2012 18:20:23 -0400
From:	Andy Walls <awalls@...metrocast.net>
To:	Ezequiel Garcia <elezegarcia@...il.com>
Cc:	linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
	Julia.Lawall@...6.fr, kernel-janitors@...r.kernel.org,
	Peter Senna Tschudin <peter.senna@...il.com>
Subject: Re: [PATCH 08/23] cx25840: Replace memcpy with struct assignment

On Tue, 2012-10-23 at 16:57 -0300, Ezequiel Garcia wrote:
> This kind of memcpy() is error-prone. Its replacement with a struct
> assignment is prefered because it's type-safe and much easier to read.
> 
> Found by coccinelle. Hand patched and reviewed.
> Tested by compilation only.
> 
> A simplified version of the semantic match that finds this problem is as
> follows: (http://coccinelle.lip6.fr/)
> 
> // <smpl>
> @@
> identifier struct_name;
> struct struct_name to;
> struct struct_name from;
> expression E;
> @@
> -memcpy(&(to), &(from), E);
> +to = from;
> // </smpl>
> 

This patch is fine.

Signed-off-by: Andy Walls <awalls@...metrocast.net>

> Signed-off-by: Peter Senna Tschudin <peter.senna@...il.com>
> Signed-off-by: Ezequiel Garcia <elezegarcia@...il.com>
> ---
>  drivers/media/i2c/cx25840/cx25840-ir.c |    6 ++----
>  1 files changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/media/i2c/cx25840/cx25840-ir.c b/drivers/media/i2c/cx25840/cx25840-ir.c
> index 38ce76e..9ae977b 100644
> --- a/drivers/media/i2c/cx25840/cx25840-ir.c
> +++ b/drivers/media/i2c/cx25840/cx25840-ir.c
> @@ -1251,13 +1251,11 @@ int cx25840_ir_probe(struct v4l2_subdev *sd)
>  		cx25840_write4(ir_state->c, CX25840_IR_IRQEN_REG, 0);
>  
>  	mutex_init(&ir_state->rx_params_lock);
> -	memcpy(&default_params, &default_rx_params,
> -		       sizeof(struct v4l2_subdev_ir_parameters));
> +	default_params = default_rx_params;
>  	v4l2_subdev_call(sd, ir, rx_s_parameters, &default_params);
>  
>  	mutex_init(&ir_state->tx_params_lock);
> -	memcpy(&default_params, &default_tx_params,
> -		       sizeof(struct v4l2_subdev_ir_parameters));
> +	default_params = default_tx_params;
>  	v4l2_subdev_call(sd, ir, tx_s_parameters, &default_params);
>  
>  	return 0;


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