linux-kernel - Re: [PATCH 10/11] Introduce single user mode

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Message-ID: <m2sje7hv33.fsf@firstfloor.org>
Date:	Thu, 07 Jun 2012 10:48:16 -0700
From:	Andi Kleen <andi@...stfloor.org>
To:	stefani@...bold.net
Cc:	linux-kernel@...r.kernel.org, gregkh@...uxfoundation.org,
	oneukum@...e.de, alan@...rguk.ukuu.org.uk,
	linux-usb@...r.kernel.org
Subject: Re: [PATCH 10/11] Introduce single user mode

stefani@...bold.net writes:
>  	}
>  
> +	if (dev->in_use) {
> +		retval = -EBUSY;
> +		goto exit;
> +	}

This plus setting the flag has to be inside the mutex, otherwise you
have an obvious race.

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only
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