linux-kernel - Re: [PATCH 3/9] Input: pixcir_i2c_ts: Initialize interrupt mode and power mode

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Message-ID: <20131218141408.GC28504@core.coreip.homeip.net>
Date:	Wed, 18 Dec 2013 06:14:08 -0800
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Roger Quadros <rogerq@...com>
Cc:	rydberg@...omail.se, jcbian@...cir.com.cn,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org
Subject: Re: [PATCH 3/9] Input: pixcir_i2c_ts: Initialize interrupt mode and
 power mode

On Wed, Dec 18, 2013 at 02:51:14PM +0530, Roger Quadros wrote:
> +
> +static int pixcir_stop(struct pixcir_i2c_ts_data *ts)
> +{
> +	struct device *dev = &ts->client->dev;
> +	int ret;
> +
> +	/* disable interrupt generation */
> +	ret = pixcir_int_enable(ts, 0);
> +	if (ret) {
> +		dev_err(dev, "Failed to disable interrupt generation\n");
> +		return ret;
> +	}
> +
> +	disable_irq(ts->client->irq);

Why do you need to disable IRQ? If you disable interrupt generation in
the chip I think you only need to call synchronize_irq() to make sure
it's completed if it happens to be running. Also you need to move the
code:

	tsdata->exiting = true;
	mb();

here from pixcir_i2c_ts_remove() to make sure handler exits promptly.

You will also need to reset tsdata->exiting in your start method.

Thanks.

-- 
Dmitry
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