When VM boots with one virtio-crypto PCI device and builtin backend,
execute openssl benchmark command with multiple processes, such as
  openssl speed -evp aes-128-cbc -engine afalg  -seconds 10 -multi 32

openssl processes will hangup and there is error reported like this:
  virtio_crypto virtio0: dataq.0:id 3 is not a head!

It seems that the data virtqueue need protection when it is handled
for virtio done notification. If the spinlock protection is added
in virtcrypto_done_task(), openssl benchmark with multiple processes
works well.

Signed-off-by: Bibo Mao <maobibo@loongson.cn>
---
 drivers/crypto/virtio/virtio_crypto_core.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/crypto/virtio/virtio_crypto_core.c b/drivers/crypto/virtio/virtio_crypto_core.c
index 3d241446099c..ccc6b5c1b24b 100644
--- a/drivers/crypto/virtio/virtio_crypto_core.c
+++ b/drivers/crypto/virtio/virtio_crypto_core.c
@@ -75,15 +75,20 @@ static void virtcrypto_done_task(unsigned long data)
 	struct data_queue *data_vq = (struct data_queue *)data;
 	struct virtqueue *vq = data_vq->vq;
 	struct virtio_crypto_request *vc_req;
+	unsigned long flags;
 	unsigned int len;
 
+	spin_lock_irqsave(&data_vq->lock, flags);
 	do {
 		virtqueue_disable_cb(vq);
 		while ((vc_req = virtqueue_get_buf(vq, &len)) != NULL) {
+			spin_unlock_irqrestore(&data_vq->lock, flags);
 			if (vc_req->alg_cb)
 				vc_req->alg_cb(vc_req, len);
+			spin_lock_irqsave(&data_vq->lock, flags);
 		}
 	} while (!virtqueue_enable_cb(vq));
+	spin_unlock_irqrestore(&data_vq->lock, flags);
 }
 
 static void virtcrypto_dataq_callback(struct virtqueue *vq)
-- 
2.39.3