Deference the pointer to take effect

Author: Cuda-Chen

virtio-snd.c

@@ -729,13 +729,13 @@ static void __virtio_snd_frame_enqueue(void *payload,
 {
     uint32_t prod_head, cons_tail;
     uint32_t prod_next, free_entries;
-    virtio_snd_prop_t props =
-        vsnd_props[stream_id]; /* XXX: access the address for the ease of data
+    virtio_snd_prop_t *props =
+        &vsnd_props[stream_id]; /* XXX: access the address for the ease of data
                                   manipulation */
-    uint32_t mask = props.pp.buffer_bytes;
+    uint32_t mask = props->pp.buffer_bytes;
 
-    prod_head = props.ring.prod.head;
-    cons_tail = props.ring.cons.tail;
+    prod_head = props->ring.prod.head;
+    cons_tail = props->ring.cons.tail;
     /* The subtraction is done between two unsigned 32bits value
      * (the result is always modulo 32 bits even if we have
      * prod_head > cons_tail). So 'free_entries' is always between 0
@@ -746,22 +746,21 @@ static void __virtio_snd_frame_enqueue(void *payload,
     if (n > free_entries)
         fprintf(stderr, "payload length larger than free_entries\n");
     prod_next = prod_head + n;
-    props.ring.prod.head = prod_next;
+    props->ring.prod.head = prod_next;
 
     /* Write payload to ring buffer. */
-    uint32_t size = props.pp.buffer_bytes;
+    uint32_t size = props->pp.buffer_bytes;
     uint32_t idx = prod_head & mask;
-    uint32_t i;
     if (idx + n < size) {
-        memcpy(props.ring.buffer + idx, payload, n);
+        memcpy(props->ring.buffer + idx, payload, n);
     } else {
-        memcpy(props.ring.buffer + idx, payload, size - idx);
-        memcpy(props.ring.buffer, payload, n - (size - idx));
+        memcpy(props->ring.buffer + idx, payload, size - idx);
+        memcpy(props->ring.buffer, payload, n - (size - idx));
     }
     asm("" ::: "memory");
 
     /* Update prod_tail */
-    props.ring.prod.tail = prod_next;
+    props->ring.prod.tail = prod_next;
 }
 
 typedef struct {