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Diffstat (limited to 'drivers/virtio/virtio_mmio.c')
| -rw-r--r-- | drivers/virtio/virtio_mmio.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/virtio/virtio_mmio.c b/drivers/virtio/virtio_mmio.c index c9699a59f93c..f9a36bc7ac27 100644 --- a/drivers/virtio/virtio_mmio.c +++ b/drivers/virtio/virtio_mmio.c @@ -253,6 +253,11 @@ static void vm_set_status(struct virtio_device *vdev, u8 status) /* We should never be setting status to 0. */ BUG_ON(status == 0); + /* + * Per memory-barriers.txt, wmb() is not needed to guarantee + * that the the cache coherent memory writes have completed + * before writing to the MMIO region. + */ writel(status, vm_dev->base + VIRTIO_MMIO_STATUS); } |