Re: [linux-usb-devel] Re: Linux 2.6.16-rc3

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On Fri, Feb 17, 2006 at 04:42:43PM -0800, James Bottomley wrote:
> +static void execute_in_process_context_work(void *data)
> +{
> +	void (*fn)(void *data);
> +	struct execute_work *ew = data;
> +
> +	fn = ew->fn;
> +	data = ew->data;
> +
> +	fn(data);
> +}

After removing kfree(), which was here in the initial implementation,
this function became a thunk which does nothing useful - we can just
stick fn and data directly into work_struct.

> +
> +/**
> + * execute_in_process_context - reliably execute the routine with user context
> + * @fn:		the function to execute
> + * @data:	data to pass to the function
> + *
> + * Executes the function immediately if process context is available,
> + * otherwise schedules the function for delayed execution.
> + *
> + * Returns:	0 - function was executed
> + *		1 - function was scheduled for execution
> + */
> +int execute_in_process_context(void (*fn)(void *data), void *data,
> +			       struct execute_work *ew)
> +{
> +	if (!in_interrupt()) {
> +		fn(data);
> +		return 0;
> +	}
> +
> +	INIT_WORK(&ew->work, execute_in_process_context_work, ew);
> +	ew->fn = fn;
> +	ew->data = data;
> +	schedule_work(&ew->work);
> +
> +	return 1;
> +}

Then this becomes:

int execute_in_process_context(void (*fn)(void *data), void *data,
			       struct work_struct *work)
{
	if (!in_interrupt()) {
		fn(data);
		return 0;
	}

	INIT_WORK(work, fn, data);
	schedule_work(work);
	return 1;
}

(and struct execute_work is no longer needed).

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