linux-kernel - Re: [PATCH 15/19] x86, irq: Move irq_remapped() check into free_remapped

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Date:	Sun, 26 Aug 2012 20:27:55 +0200
From:	Sebastian Andrzej Siewior <sebastian@...akpoint.cc>
To:	Joerg Roedel <joerg.roedel@....com>
Cc:	x86@...nel.org, linux-kernel@...r.kernel.org, joro@...tes.org,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Yinghai Lu <yinghai@...nel.org>
Subject: Re: [PATCH 15/19] x86, irq: Move irq_remapped() check into
 free_remapped_irq

On Mon, Aug 20, 2012 at 03:56:01PM +0200, Joerg Roedel wrote:
> --- a/arch/x86/kernel/apic/io_apic.c
> +++ b/arch/x86/kernel/apic/io_apic.c
> @@ -2981,8 +2981,8 @@ void destroy_irq(unsigned int irq)
>  
>  	irq_set_status_flags(irq, IRQ_NOREQUEST|IRQ_NOPROBE);
>  
> -	if (irq_remapped(cfg))
> -		free_remapped_irq(irq);
> +	free_remapped_irq(irq);
> +
>  	raw_spin_lock_irqsave(&vector_lock, flags);
>  	__clear_irq_vector(irq, cfg);
>  	raw_spin_unlock_irqrestore(&vector_lock, flags);
> diff --git a/drivers/iommu/irq_remapping.c b/drivers/iommu/irq_remapping.c
> index 3957fb2..f2affc7 100644
> --- a/drivers/iommu/irq_remapping.c
> +++ b/drivers/iommu/irq_remapping.c
> @@ -229,10 +229,13 @@ int set_remapped_irq_affinity(struct irq_data *data, const struct cpumask *mask,
>  
>  void free_remapped_irq(int irq)
>  {
> +	struct irq_cfg *cfg = irq_get_chip_data(irq);
> +
>  	if (!remap_ops || !remap_ops->free_irq)
>  		return;
>  
> -	remap_ops->free_irq(irq);
> +	if (cfg && irq_remapped(cfg))

You shuffle code with the exception that you now check for cfg. Why?

> +		remap_ops->free_irq(irq);
>  }
>  
>  void compose_remapped_msi_msg(struct pci_dev *pdev,

Sebastian
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