linux-kernel - Re: [PATCH] Input: xpad - Fix double URB submission races

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Message-ID: <20150730064545.GA35939@dtor-ws>
Date:	Wed, 29 Jul 2015 23:45:45 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Laura Abbott <labbott@...oraproject.org>
Cc:	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-usb@...r.kernel.org
Subject: Re: [PATCH] Input: xpad - Fix double URB submission races

Hi Laura,

On Wed, Jul 29, 2015 at 02:27:23PM -0700, Laura Abbott wrote:
@@ -791,6 +796,9 @@ static int xpad_play_effect(struct input_dev *dev, void *data, struct ff_effect
>  {
>  	struct usb_xpad *xpad = input_get_drvdata(dev);
>  
> +	if (test_and_set_bit(OUT_IRQ_SUBMITTED, &xpad->odata_flags))
> +		return 0;
> +

So this results in basically ignoring the request if urb is "busy" which
is not the best way of handling this. You need to note that there is
pending effect to be played and submit it after currently executing
request completes.

The same needs to be done for led toggling request.

Thanks.

-- 
Dmitry
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