linux-kernel - Re: [PATCH v2] virtio: Use pci_enable_msix_exact() instead of pci_enable

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Message-ID: <20140222211824.GA9777@redhat.com>
Date:	Sat, 22 Feb 2014 23:18:24 +0200
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Alexander Gordeev <agordeev@...hat.com>
Cc:	Rusty Russell <rusty@...tcorp.com.au>,
	linux-kernel@...r.kernel.org, virtio-dev@...ts.oasis-open.org,
	virtualization@...ts.linux-foundation.org,
	linux-pci@...r.kernel.org
Subject: Re: [PATCH v2] virtio: Use pci_enable_msix_exact() instead of
 pci_enable_msix()

On Fri, Feb 21, 2014 at 06:01:28PM +0100, Alexander Gordeev wrote:
> As result of deprecation of MSI-X/MSI enablement functions
> pci_enable_msix() and pci_enable_msi_block() all drivers
> using these two interfaces need to be updated to use the
> new pci_enable_msi_range()  or pci_enable_msi_exact()
> and pci_enable_msix_range() or pci_enable_msix_exact()
> interfaces.


Acked-by: Michael S. Tsirkin <mst@...hat.com>

> Signed-off-by: Alexander Gordeev <agordeev@...hat.com>
> Cc: Rusty Russell <rusty@...tcorp.com.au>
> Cc: "Michael S. Tsirkin" <mst@...hat.com>
> Cc: virtio-dev@...ts.oasis-open.org
> Cc: virtualization@...ts.linux-foundation.org
> Cc: linux-pci@...r.kernel.org
> ---
>  drivers/virtio/virtio_pci.c |    6 ++----
>  1 files changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/virtio/virtio_pci.c b/drivers/virtio/virtio_pci.c
> index a416f9b..101db3f 100644
> --- a/drivers/virtio/virtio_pci.c
> +++ b/drivers/virtio/virtio_pci.c
> @@ -333,10 +333,8 @@ static int vp_request_msix_vectors(struct virtio_device *vdev, int nvectors,
>  	for (i = 0; i < nvectors; ++i)
>  		vp_dev->msix_entries[i].entry = i;
>  
> -	/* pci_enable_msix returns positive if we can't get this many. */
> -	err = pci_enable_msix(vp_dev->pci_dev, vp_dev->msix_entries, nvectors);
> -	if (err > 0)
> -		err = -ENOSPC;
> +	err = pci_enable_msix_exact(vp_dev->pci_dev,
> +				    vp_dev->msix_entries, nvectors);
>  	if (err)
>  		goto error;
>  	vp_dev->msix_enabled = 1;
> -- 
> 1.7.7.6
> 
> -- 
> Regards,
> Alexander Gordeev
> agordeev@...hat.com
--
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