qat: fix crash when nothing to enqueue

Crash seen in qat pmd when nb_ops=0 on rte_cryptodev_enqueue_burst() API

Signed-off-by: Fiona Trahe <fiona.trahe@intel.com>

diff --git a/drivers/crypto/qat/qat_crypto.c b/drivers/crypto/qat/qat_crypto.c
index 5c41a89..9001558 100644 (file)
--- a/drivers/crypto/qat/qat_crypto.c
+++ b/drivers/crypto/qat/qat_crypto.c
@@ -570,6 +570,9 @@ qat_pmd_enqueue_op_burst(void *qp, struct rte_crypto_op **ops,
        register uint32_t tail;
        int overflow;
 
+       if (unlikely(nb_ops == 0))
+               return 0;
+
        /* read params used a lot in main loop into registers */
        queue = &(tmp_qp->tx_q);
        base_addr = (uint8_t *)queue->base_addr;