linux-kernel - Re: [PATCH RFC 06/77] PCI/MSI: Factor out pci_get_msi

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Message-ID: <1380837174.3419.21.camel@bwh-desktop.uk.level5networks.com>
Date:	Thu, 3 Oct 2013 22:52:54 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Alexander Gordeev <agordeev@...hat.com>
CC:	<linux-kernel@...r.kernel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Michael Ellerman <michael@...erman.id.au>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Ingo Molnar <mingo@...hat.com>, Tejun Heo <tj@...nel.org>,
	Dan Williams <dan.j.williams@...el.com>,
	Andy King <acking@...are.com>, Jon Mason <jon.mason@...el.com>,
	Matt Porter <mporter@...nel.crashing.org>,
	<linux-pci@...r.kernel.org>, <linux-mips@...ux-mips.org>,
	<linuxppc-dev@...ts.ozlabs.org>, <linux390@...ibm.com>,
	<linux-s390@...r.kernel.org>, <x86@...nel.org>,
	<linux-ide@...r.kernel.org>, <iss_storagedev@...com>,
	<linux-nvme@...ts.infradead.org>, <linux-rdma@...r.kernel.org>,
	<netdev@...r.kernel.org>, <e1000-devel@...ts.sourceforge.net>,
	<linux-driver@...gic.com>,
	Solarflare linux maintainers <linux-net-drivers@...arflare.com>,
	"VMware, Inc." <pv-drivers@...are.com>,
	<linux-scsi@...r.kernel.org>
Subject: Re: [PATCH RFC 06/77] PCI/MSI: Factor out pci_get_msi_cap()
 interface

On Wed, 2013-10-02 at 12:48 +0200, Alexander Gordeev wrote:
[...]
> --- a/drivers/pci/msi.c
> +++ b/drivers/pci/msi.c
> @@ -812,6 +812,21 @@ static int pci_msi_check_device(struct pci_dev *dev, int nvec, int type)
>  	return 0;
>  }
>  
> +int pci_get_msi_cap(struct pci_dev *dev)
> +{
> +	int ret;
> +	u16 msgctl;
> +
> +	if (!dev->msi_cap)
> +		return -EINVAL;
[...]
> --- a/include/linux/pci.h
> +++ b/include/linux/pci.h
> @@ -1144,6 +1144,11 @@ struct msix_entry {
>  
> 
>  #ifndef CONFIG_PCI_MSI
> +static inline int pci_get_msi_cap(struct pci_dev *dev)
> +{
> +	return -1;
[...]

Shouldn't this also return -EINVAL?

Ben.

-- 
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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