linux-kernel - Re: [PATCH v1 1/2] virtio_pci: use queue idx instead of array idx to set up the vq

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Date:   Thu, 3 Jan 2019 10:57:20 +0100
From:   Cornelia Huck <cohuck@...hat.com>
To:     Wei Wang <wei.w.wang@...el.com>
Cc:     virtio-dev@...ts.oasis-open.org, linux-kernel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, kvm@...r.kernel.org,
        mst@...hat.com, borntraeger@...ibm.com, pbonzini@...hat.com,
        dgilbert@...hat.com
Subject: Re: [PATCH v1 1/2] virtio_pci: use queue idx instead of array idx
 to set up the vq

On Fri, 28 Dec 2018 10:26:25 +0800
Wei Wang <wei.w.wang@...el.com> wrote:

> When find_vqs, there will be no vq[i] allocation if its corresponding
> names[i] is NULL. For example, the caller may pass in names[i] (i=4)
> with names[2] being NULL because the related feature bit is turned off,
> so technically there are 3 queues on the device, and name[4] should
> correspond to the 3rd queue on the device.
> 
> So we use queue_idx as the queue index, which is increased only when the
> queue exists.
> 
> Signed-off-by: Wei Wang <wei.w.wang@...el.com>
> ---
>  drivers/virtio/virtio_pci_common.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)

Reviewed-by: Cornelia Huck <cohuck@...hat.com>