linux-kernel - Re: [PATCH] NVMe: Only release requested regions

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Date:	Thu, 12 May 2016 00:03:52 -0700
From:	Christoph Hellwig <hch@...radead.org>
To:	Johannes Thumshirn <jthumshirn@...e.de>
Cc:	Keith Busch <keith.busch@...el.com>, Jens Axboe <axboe@...com>,
	linux-kernel@...r.kernel.org, linux-nvme@...ts.infradead.org,
	linux-pci@...r.kernel.org
Subject: Re: [PATCH] NVMe: Only release requested regions

>  static void nvme_dev_unmap(struct nvme_dev *dev)
>  {
> +	struct pci_dev *pdev = to_pci_dev(dev->dev);
> +	int bars;
> +
>  	if (dev->bar)
>  		iounmap(dev->bar);
> -	pci_release_regions(to_pci_dev(dev->dev));
> +
> +	bars = pci_select_bars(pdev, IORESOURCE_MEM);
> +	pci_release_selected_regions(pdev, bars);

This looks fine, but I really hate this API.

Can someone add these two nice helpers to pci.h:

static inline int
pci_request_mem_regions(struct pci_dev *pdev, const char *name)
{
	return pci_request_selected_regions(pdev,
			pci_select_bars(pdev, IORESOURCE_MEM), name);
}

static inline void
pci_release_mem_regions(struct pci_dev *pdev)
{
	return pci_release_selected_regions(pdev,
			pci_select_bars(pdev, IORESOURCE_MEM));
}

But for now this should do it:

Reviewed-by: Christoph Hellwig <hch@....de>