linux-kernel - Re: [RFC 1/3] hvc_console: rework setup to replace irq functions with callbacks

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Message-Id: <1223886972.8157.241.camel@pasglop>
Date:	Mon, 13 Oct 2008 19:36:12 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Christian Borntraeger <borntraeger@...ibm.com>
Cc:	Linux PPC devel <linuxppc-dev@...abs.org>,
	Virtualization Mailing List <virtualization@...ts.osdl.org>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>
Subject: Re: [RFC 1/3] hvc_console: rework setup to replace irq functions
	with callbacks


>  	if (--hp->count == 0) {
> -		if (hp->ops->notifier_del)
> -			hp->ops->notifier_del(hp, hp->data);
> -
>  		/* We are done with the tty pointer now. */
>  		hp->tty = NULL;
>  		spin_unlock_irqrestore(&hp->lock, flags);
>  
> +		if (hp->ops->notifier_del)
> +			hp->ops->notifier_del(hp, hp->data);
> +

I will try. Of course the risk here is that the interrupt happens
after we set hp->tty to NULL, so we probably need to check within the
interrupt handler for a NULL tty. I haven't checked if that's the case
(I'm not in front of the code right now).

Ben.


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