linux-kernel - Re: [PATCH] xen-pciback: Use pci_enable_msix_range() instead of pci_enable

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Message-ID: <20140219160501.GA32067@dhcp-26-207.brq.redhat.com>
Date:	Wed, 19 Feb 2014 17:05:01 +0100
From:	Alexander Gordeev <agordeev@...hat.com>
To:	Boris Ostrovsky <boris.ostrovsky@...cle.com>
Cc:	linux-kernel@...r.kernel.org,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	David Vrabel <david.vrabel@...rix.com>,
	linux-pci@...r.kernel.org
Subject: Re: [PATCH] xen-pciback: Use pci_enable_msix_range() instead of
 pci_enable_msix()

On Wed, Feb 19, 2014 at 10:40:19AM -0500, Boris Ostrovsky wrote:
> >>diff --git a/drivers/xen/xen-pciback/pciback_ops.c
> >>b/drivers/xen/xen-pciback/pciback_ops.c
> >>index 64eb0cd..f5b4c3e 100644
> >>--- a/drivers/xen/xen-pciback/pciback_ops.c
> >>+++ b/drivers/xen/xen-pciback/pciback_ops.c
> >>@@ -213,9 +213,15 @@ int xen_pcibk_enable_msix(struct
> >>xen_pcibk_device *pdev,
> >>          entries[i].vector = op->msix_entries[i].vector;
> >>      }
> >>  -    result = pci_enable_msix(dev, entries, op->value);
> >>+    result = pci_enable_msix_range(dev, entries, op->value, op->value);
> >>+    if (result < op->value) {
> >
> >
> >I think it would be better to have 'if (result != op->value)', in
> >case op->value is negative (which presumably it should never be).
> 
> 
> Better yet, at the top of the routine we check 'if (op->value >
> SH_INFO_MAX_VEC)'. If you add '|| op->value < 0' we'd be all set.

xen_pci_op::value is uint32_t

> -boris

-- 
Regards,
Alexander Gordeev
agordeev@...hat.com
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