netdev - Re: [PATCH RFC 50/77] mlx5: Update MSI/MSI-X interrupts enablement code

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Date:	Thu, 10 Oct 2013 18:29:45 +0300
From:	Eli Cohen <eli@....mellanox.co.il>
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 50/77] mlx5: Update MSI/MSI-X interrupts enablement
 code

On Thu, Oct 03, 2013 at 09:48:39PM +0200, Alexander Gordeev wrote:
> 
> pci_enable_msix() may fail, but it can not return a positive number.
>

That is true according to the current logic but the comment on top of
pci_enable_msix() still says:
"A return of < 0 indicates a failure.  Or a return of > 0 indicates
that driver request is exceeding the number of irqs or MSI-X vectors
available"

So you're counting on an implementation that may change in the future.
I think leaving the code as it is now is safer.
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