linux-kernel - Re: [PATCH] Add ff-memless-next module

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Date:	Thu, 26 Dec 2013 08:58:37 -0800
From:	Joe Perches <joe@...ches.com>
To:	Michal Malý <madcatxster@...fuk.cz>
Cc:	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	dmitry.torokhov@...il.com, elias.vds@...il.com
Subject: Re: [PATCH] Add ff-memless-next module

On Thu, 2013-12-26 at 17:33 +0100, Michal Malý wrote:
> This patch adds "ff-memless-next" module. This module is based on the current
> "ff-memless" module but it has considerably extended capabilities. These include:
[]
> Why is this written as a new module and not a patch for "ff-memless"? This
> module uses a different API for the HW-specific driver; this was a necessary
> step to make use of the module's additional features. All 25 drivers that
> currently use "ff-memless" would have to be updated. "ff-memless-next" currently
> does not support FF_RUMBLE which is needed to support various joypads.

Thanks for that explanation.

[]

> +static unsigned long mlnx_get_envelope_update_time(const struct mlnx_effect *mlnxeff,
> +						   const unsigned long update_rate_jiffies)
> +{

> +	/* Effect has an envelope with nonzero fade time */
> +	if (mlnxeff->effect.replay.length) {
> +		if (!envelope->fade_length)
> +			return mlnxeff->stop_at;
> +
> +		/* Schedule the next update when the fade begins */
> +		if (time_before(mlnxeff->updated_at, mlnxeff->fade_begin))
> +			return mlnxeff->fade_begin;
> +
> +		/* Already fading */
> +		else {
> +			fade_next = mlnxeff->updated_at + update_rate_jiffies;
> +

There's no need for an else and extra indentation here
 
	if (foo)
		return;
	else {			/* unnecessary else */
		bar...
	}

please just use

	if (foo)
		return;

	bar...

> +			/* Schedule update when the effect stops */
> +			if (time_after(fade_next, mlnxeff->stop_at))
> +				return mlnxeff->stop_at;
> +			/* Schedule update at the next checkpoint */
> +			else
> +				return fade_next;
> +		}
> +	}


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