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[SCSI] virtio-scsi: unlock during kick

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Separate virtqueue_kick_prepare from virtqueue_notify, so that the
expensive vmexit is done without holding the lock.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
This commit is contained in:
Paolo Bonzini 2012-06-13 16:56:31 +02:00 committed by James Bottomley
parent a752359f2b
commit b5ee8f2802
1 changed files with 3 additions and 1 deletions
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4
drivers/scsi/virtio_scsi.c
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@ -264,9 +264,11 @@ static int virtscsi_kick_cmd(struct virtio_scsi *vscsi, struct virtqueue *vq,
ret = virtqueue_add_buf(vq, vscsi->sg, out_num, in_num, cmd, gfp);
if (ret >= 0)
virtqueue_kick(vq);
ret = virtqueue_kick_prepare(vq);
spin_unlock_irqrestore(&vscsi->vq_lock, flags);
if (ret > 0)
virtqueue_notify(vq);
return ret;
}