Re: [PATCH v4 4/5] Input: add haptic drvier on max77843

[Dmitry Torokhov]

Hi Jaew9on,

On Mon, Feb 23, 2015 at 05:09:50PM +0900, Jaewon Kim wrote:
> This patch adds support for haptic driver on max77843
> MFD(Multi Function Device) with PMIC, MUIC, LED, CHARGER.
> 
> This driver supports external pwm and LRA(Linear Resonant Actuator) motor.
> And it supports ff-memless interface from inpu framework.
> 
> Cc: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
> Signed-off-by: Jaewon Kim <jaewon02.kim@xxxxxxxxxxx>

...

> +static void max77843_haptic_play_work(struct work_struct *work)
> +{
> +	struct max77843_haptic *haptic =
> +			container_of(work, struct max77843_haptic, work);
> +	int error;
> +
> +	mutex_lock(&haptic->mutex);
> +
> +	if (haptic->suspended)
> +		mutex_unlock(&haptic->mutex);

Huh?

> +
> +	error = max77843_haptic_set_duty_cycle(haptic);
> +	if (error) {
> +		dev_err(haptic->dev, "failed to set duty cycle: %d\n", error);
> +		return;

Here you are leaving with the mutex held.

> +	}
> +
> +	if (haptic->magnitude) {
> +		error = max77843_haptic_enable(haptic);
> +		if (error)
> +			dev_err(haptic->dev,
> +					"cannot enable haptic: %d\n", error);
> +	} else {
> +		max77843_haptic_disable(haptic);
> +		if (error)
> +			dev_err(haptic->dev,
> +					"cannot disable haptic: %d\n", error);
> +	}
> +
> +	mutex_unlock(&haptic->mutex);
> +}
> +

The rest seems quite reasonable.

Thanks.

-- 
Dmitry
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