diff options
| author |   Rusty Russell <rusty@rustcorp.com.au> | 2015-02-11 15:01:14 +1030 |
|---|---|---|
| committer | Rusty Russell <rusty@rustcorp.com.au> | 2015-02-11 15:03:16 +1030 |
| commit | 7abb568dbb32d055ec6a5633d26fb39fbcd525e3 (patch) | |
| tree | 7e5aac0a98bbcd55d764a28c84743a02ff72e320 /drivers/virtio/virtio_pci_modern.c | |
| parent | virtio: Don't expose legacy config features when VIRTIO_CONFIG_NO_LEGACY defined. (diff) | |
| download | linux-dev-7abb568dbb32d055ec6a5633d26fb39fbcd525e3.tar.xz linux-dev-7abb568dbb32d055ec6a5633d26fb39fbcd525e3.zip | |
virtio_pci: use 16-bit accessor for queue_enable.
Since PCI is little endian, 8-bit access might work, but the spec section
is very clear on this:
4.1.3.1 Driver Requirements: PCI Device Layout
The driver MUST access each field using the “natural” access method,
i.e. 32-bit accesses for 32-bit fields, 16-bit accesses for 16-bit
fields and 8-bit accesses for 8-bit fields.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'drivers/virtio/virtio_pci_modern.c')
| -rw-r--r-- | drivers/virtio/virtio_pci_modern.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/virtio/virtio_pci_modern.c b/drivers/virtio/virtio_pci_modern.c index f16e462cb4ef..2aa38e59db2e 100644 --- a/drivers/virtio/virtio_pci_modern.c +++ b/drivers/virtio/virtio_pci_modern.c @@ -294,7 +294,7 @@ static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev, /* Check if queue is either not available or already active. */ num = ioread16(&cfg->queue_size); - if (!num || ioread8(&cfg->queue_enable)) + if (!num || ioread16(&cfg->queue_enable)) return ERR_PTR(-ENOENT); if (num & (num - 1)) { @@ -394,7 +394,7 @@ static int vp_modern_find_vqs(struct virtio_device *vdev, unsigned nvqs, */ list_for_each_entry(vq, &vdev->vqs, list) { iowrite16(vq->index, &vp_dev->common->queue_select); - iowrite8(1, &vp_dev->common->queue_enable); + iowrite16(1, &vp_dev->common->queue_enable); } return 0; |