Re: [PATCH 1/6] Core driver for WM97xx touchscreens

[Dmitry Torokhov <dmitry.torokhov@gmail.com>]

Hi Mark,

On Sat, Jan 26, 2008 at 05:28:31PM +0000, Mark Brown wrote:
> +
> +	/* register our battery device */
> +	wm->battery_dev = platform_device_alloc("wm97xx-battery", 0);
> +	if (!wm->battery_dev)
> +		goto batt_err;
...
> + batt_err:
> +	input_unregister_device(wm->input_dev);
> +	kfree(wm);
> +	return ret;
> +}

The probe error handling is not quite correct. When we reach the fragment
above ret variable is 0 so if platfrom_device_alloc() fails we will return
0 and the device will be considered bound but in half-dead state. Please
make sure that proper error is returned in all cases. Also please do not
mix out of line and in-line error unwinding (input_free_device() should
be called in the error path and if you are concerned about double-free
after input_unregister_device() just set wm->input_dev to NULL there).

Thanks.

-- 
Dmitry