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Commit b5ee8f28 authored by Paolo Bonzini's avatar Paolo Bonzini Committed by James Bottomley
Browse files

[SCSI] virtio-scsi: unlock during kick 



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

Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: default avatarJames Bottomley <JBottomley@Parallels.com>
parent a752359f

drivers/scsi/virtio_scsi.c

+3 −1
Original line number Diff line number Diff line
@@ -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;

}