linux-kernel - Re: linux/kernel/irq/chip.c IRQ disable, shutdown bug

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Message-Id: <20080223000717.3ed3a4c1.akpm@linux-foundation.org>
Date:	Sat, 23 Feb 2008 00:07:17 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"Hennerich, Michael" <Michael.Hennerich@...log.com>
Cc:	<linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: linux/kernel/irq/chip.c IRQ disable, shutdown bug

On Fri, 15 Feb 2008 14:10:18 -0000 "Hennerich, Michael" <Michael.Hennerich@...log.com> wrote:

> free_irq() does not disable/mask the irq, in case disable or shutdown in struct irq_chip is left uninitilazied.
> 
> /**
>  * struct irq_chip - hardware interrupt chip descriptor
>  *
>  * @name:		name for /proc/interrupts
>  * @startup:		start up the interrupt (defaults to ->enable if NULL)
>  * @shutdown:		shut down the interrupt (defaults to ->disable if NULL)
>  * @enable:		enable the interrupt (defaults to chip->unmask if NULL)
>  * @disable:		disable the interrupt (defaults to chip->mask if NULL)
> 
> 
> According to linux/irq.h struct irq_chip information,
> chip->disable should default to chip->mask if NULL.
> However irq_chip_set_defaults(struct irq_chip *chip) will set it to default_disable a empty function.
> 
> 
> Looking through various architectures, it's pretty common that disable and shutdown is NULL.
> So this bug affects many architectures.
> 
> This patch fixes the issue.
> 

Please send a Signed-off-by: for this work, as per
Documentation/SubmittingPatches, thanks.


> Index: irq/chip.c
> ===================================================================
> --- irq/chip.c  (revision 4276)
> +++ irq/chip.c  (working copy)

Please prepare future patches in `patch -p1' form.  This should have been

> --- a/kernel/irq/chip.c
> +++ a/kernel/irq/chip.c


> @@ -233,6 +233,10 @@
>   */
>  static void default_disable(unsigned int irq)
>  {
> +       struct irq_desc *desc = irq_desc + irq;
> +
> +       desc->chip->mask(irq);
> +       desc->status |= IRQ_MASKED;
>  }
> 
>  /*

Ingo, Thomas: ack?
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