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Subject[PATCH v1 1/2] virtio_pci: use queue idx instead of array idx to set up the vq
Date
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@intel.com>
---
drivers/virtio/virtio_pci_common.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/virtio/virtio_pci_common.c b/drivers/virtio/virtio_pci_common.c
index 465a6f5..d0584c0 100644
--- a/drivers/virtio/virtio_pci_common.c
+++ b/drivers/virtio/virtio_pci_common.c
@@ -285,7 +285,7 @@ static int vp_find_vqs_msix(struct virtio_device *vdev, unsigned nvqs,
{
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
u16 msix_vec;
- int i, err, nvectors, allocated_vectors;
+ int i, err, nvectors, allocated_vectors, queue_idx = 0;

vp_dev->vqs = kcalloc(nvqs, sizeof(*vp_dev->vqs), GFP_KERNEL);
if (!vp_dev->vqs)
@@ -321,7 +321,7 @@ static int vp_find_vqs_msix(struct virtio_device *vdev, unsigned nvqs,
msix_vec = allocated_vectors++;
else
msix_vec = VP_MSIX_VQ_VECTOR;
- vqs[i] = vp_setup_vq(vdev, i, callbacks[i], names[i],
+ vqs[i] = vp_setup_vq(vdev, queue_idx++, callbacks[i], names[i],
ctx ? ctx[i] : false,
msix_vec);
if (IS_ERR(vqs[i])) {
@@ -356,7 +356,7 @@ static int vp_find_vqs_intx(struct virtio_device *vdev, unsigned nvqs,
const char * const names[], const bool *ctx)
{
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
- int i, err;
+ int i, err, queue_idx = 0;

vp_dev->vqs = kcalloc(nvqs, sizeof(*vp_dev->vqs), GFP_KERNEL);
if (!vp_dev->vqs)
@@ -374,7 +374,7 @@ static int vp_find_vqs_intx(struct virtio_device *vdev, unsigned nvqs,
vqs[i] = NULL;
continue;
}
- vqs[i] = vp_setup_vq(vdev, i, callbacks[i], names[i],
+ vqs[i] = vp_setup_vq(vdev, queue_idx++, callbacks[i], names[i],
ctx ? ctx[i] : false,
VIRTIO_MSI_NO_VECTOR);
if (IS_ERR(vqs[i])) {
--
2.7.4
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