linux-kernel - Re: [PATCH 3/4] hvc_console: free_irq only if request

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Date:	Thu, 8 Jan 2009 17:50:31 +0100
From:	Christian Borntraeger <borntraeger@...ibm.com>
To:	Milton Miller <miltonm@....com>
Cc:	Benjiman Herrenschmidt <benh@...nel.crashing.org>,
	linuxppc-dev list <linuxppc-dev@...abs.org>,
	lkml <linux-kernel@...r.kernel.org>,
	Joe Peterson <joe@...rush.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: [PATCH 3/4] hvc_console: free_irq only if request_irq was successful

Am Donnerstag, 8. Januar 2009 schrieb Milton Miller:
> Only call free_irq if we marked the request_irq has having succeeded
> instead of whenever the the sub-driver identified the interrupt to use.
> 
> Signed-off-by: Milton Miller <miltonm@....com>
> ---
> Appears to be a bugfix but might use a bit of time in -next.
> This code was created in 2.6.28 to allow s390 to build without adding 
ifdefs.
> Many hvc-console sub-drivers have a single channel and are not modules.
> 
> Index: work.git/drivers/char/hvc_irq.c
> ===================================================================
> --- work.git.orig/drivers/char/hvc_irq.c	2009-01-08 04:07:28.000000000 -0600
> +++ work.git/drivers/char/hvc_irq.c	2009-01-08 04:07:47.000000000 -0600
> @@ -37,7 +37,7 @@ int notifier_add_irq(struct hvc_struct *
> 
>  void notifier_del_irq(struct hvc_struct *hp, int irq)
>  {
> -	if (!irq)
> +	if (!hp->irq_requested)
>  		return;
>  	free_irq(irq, hp);
>  	hp->irq_requested = 0;
> 

Looks sane.

Acked-by: Christian Borntraeger <borntraeger@...ibm.com>
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