linux-kernel - Re: [PATCH 4/4] staging: hv: Fix the code depending on struct storvsc_driver

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Date:	Wed, 23 Feb 2011 13:28:56 -0800
From:	Greg KH <greg@...ah.com>
To:	Haiyang Zhang <haiyangz@...rosoft.com>
Cc:	hjanssen@...rosoft.com, kys@...rosoft.com, v-abkane@...rosoft.com,
	gregkh@...e.de, linux-kernel@...r.kernel.org,
	devel@...uxdriverproject.org, virtualization@...ts.osdl.org
Subject: Re: [PATCH 4/4] staging: hv: Fix the code depending on struct
 storvsc_driver_context data order

On Wed, Feb 23, 2011 at 12:19:58PM -0800, Haiyang Zhang wrote:
> The patch fixed the code depending on the exact order of fields in the
> struct storvsc_driver_context. Now, we use container_of() instead of type
> casting from the first field to the container struct.
> 
> Signed-off-by: Haiyang Zhang <haiyangz@...rosoft.com>
> Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
> Signed-off-by: Hank Janssen <hjanssen@...rosoft.com>
> 
> ---
>  drivers/staging/hv/storvsc_drv.c |   14 ++++++--------
>  1 files changed, 6 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/staging/hv/storvsc_drv.c b/drivers/staging/hv/storvsc_drv.c
> index 33acee5..a364627 100644
> --- a/drivers/staging/hv/storvsc_drv.c
> +++ b/drivers/staging/hv/storvsc_drv.c
> @@ -64,8 +64,6 @@ struct storvsc_cmd_request {
>  };
>  
>  struct storvsc_driver_context {
> -	/* !! These must be the first 2 fields !! */
> -	/* FIXME this is a bug... */
>  	struct driver_context drv_ctx;
>  	struct storvsc_driver_object drv_obj;
>  };
> @@ -223,8 +221,8 @@ static int storvsc_probe(struct device *device)
>  	int ret;
>  	struct driver_context *driver_ctx =
>  				driver_to_driver_context(device->driver);
> -	struct storvsc_driver_context *storvsc_drv_ctx =
> -				(struct storvsc_driver_context *)driver_ctx;
> +	struct storvsc_driver_context *storvsc_drv_ctx = container_of(
> +		driver_ctx, struct storvsc_driver_context, drv_ctx);

Same container_of() macro/inline function issue.

thanks,

greg k-h
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