linux-kernel - Re: [RFC PATCH] add pci_{request,free}

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Message-ID: <4522E0E0.9020404@garzik.org>
Date:	Tue, 03 Oct 2006 18:14:56 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	Frederik Deweerdt <deweerdt@...e.fr>
CC:	linux-kernel@...r.kernel.org, arjan@...radead.org, matthew@....cx,
	alan@...rguk.ukuu.org.uk, akpm@...l.org, rdunlap@...otime.net,
	gregkh@...e.de
Subject: Re: [RFC PATCH] add pci_{request,free}_irq take #2

Frederik Deweerdt wrote:
> +int pci_request_irq(struct pci_dev *pdev,
> +		    irqreturn_t(*handler) (int, void *, struct pt_regs *),
> +		    unsigned long flags, const char *name)
> +{
> +	if (!is_irq_valid(pdev->irq)) {
> +		dev_printk(KERN_ERR, &pdev->dev,
> +			   "No usable irq line was found (got #%d)\n",
> +			   pdev->irq);
> +		return -EINVAL;
> +	}
> +
> +	return request_irq(pdev->irq, handler, flags,
> +			   name ? name : pdev->driver->name,
> +			   pci_get_drvdata(pdev));
> +}
> +EXPORT_SYMBOL(pci_request_irq);

> +void pci_free_irq(struct pci_dev *pdev)
> +{
> +	free_irq(pdev->irq, pci_get_drvdata(pdev));
> +}
> +EXPORT_SYMBOL(pci_free_irq);

ACK these parts


> Index: 2.6.18-mm3/include/linux/interrupt.h
> ===================================================================
> --- 2.6.18-mm3.orig/include/linux/interrupt.h
> +++ 2.6.18-mm3/include/linux/interrupt.h
> @@ -75,6 +75,13 @@ struct irqaction {
>  	struct proc_dir_entry *dir;
>  };
>  
> +#ifndef ARCH_VALIDATE_PCI_IRQ
> +static inline int is_irq_valid(unsigned int irq)
> +{
> +	return irq ? 1 : 0;
> +}
> +#endif /* ARCH_VALIDATE_PCI_IRQ */

It's not appropriate to have PCI IRQ stuff in linux/interrupt.h.

This is precisely why I passed 'struct pci_dev *' to a PCI-specific irq 
validation function, and prototyped it in linux/pci.h.

	Jeff


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