linux-kernel - Re: [PATCH 1/1] Input/Touchscreen Driver: add support AD7877 touchscreen driver

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Date:	Mon, 7 Apr 2008 16:16:05 -0400
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Bryan Wu <bryan.wu@...log.com>
Cc:	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	Michael Hennerich <michael.hennerich@...log.com>
Subject: Re: [PATCH 1/1] Input/Touchscreen Driver: add support AD7877
	touchscreen driver

Hi Bryan, Michael,

On Thu, Feb 14, 2008 at 05:17:28PM +0800, Bryan Wu wrote:
> From: Michael Hennerich <michael.hennerich@...log.com>
> 
> [try #3] Changlog (Add feedback from Dmitry Torokhov):
>  - Change handling of spi_sync / spi_async return value handling
>  - Remove depreciated dev->power.power_state
>  - Fix error return path in ad7877_probe
>  - delete pending kernel timer
>  - Some minor cleanup (indention, use dev_err etc.)

Sorry for the long silence... I have a couple of comments at the moment
but I am sure i will have more ;)

> +
> +	status = spi_sync(spi, &req->msg);
> +
> +	if (status == 0)
> +		status = req->msg.status;
> +
> +	kfree(req);
> +	return status ? status : req->sample;

Use after free here.

> +
> +	ts->irq_disabled = 1;
> +	disable_irq(spi->irq);

I am a bit uneasy here... do we need to wait for an async spi completion
here before proceeding? Overall I have some concerns about the
irq/spi/removal/sysfs iteractions, I will need some more time to look
through the driver.

> +	status = spi_sync(spi, &req->msg);
> +	ts->irq_disabled = 0;
> +	enable_irq(spi->irq);
> +

-- 
Dmitry
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