swdev: refcount swdev Init/Cleanup

tests/api.c

@@ -40796,9 +40796,7 @@ TEST_CASE testCases[] = {
 
 static void TestSetup(void)
 {
-#ifdef WOLFSSL_SWDEV
-    (void)wc_SwDev_Init();
-#endif
+/* Stub, for now. Add common test setup code here. */
 }
 
 static void TestCleanup(void)

tests/swdev/swdev_loader.c

@@ -11,13 +11,14 @@
 /* resolved at link time from swdev.o */
 extern int wc_SwDev_Callback(int devId, wc_CryptoInfo* info, void* ctx);
 
-static int swdev_registered = 0;
+/* Init always (re)registers because wolfCrypt_Cleanup wipes the cryptocb
+ * table; only the final Cleanup unregisters. */
+static wolfSSL_Atomic_Int swdev_refCount = WOLFSSL_ATOMIC_INITIALIZER(0);
 
 int wc_SwDev_Init(void)
 {
     int ret;
 
-    /* always re-register: cryptocb table is wiped by wolfCrypt_Cleanup */
     ret = wc_CryptoCb_RegisterDevice(WC_SWDEV_ID, wc_SwDev_Callback, NULL);
     if (ret != 0)
         return ret;
@@ -26,21 +27,24 @@ int wc_SwDev_Init(void)
     wc_CryptoCb_SetDeviceFindCb(wc_SwDev_FindCb);
 #endif
 
-    swdev_registered = 1;
+    (void)wolfSSL_Atomic_Int_FetchAdd(&swdev_refCount, 1);
     return 0;
 }
 
 void wc_SwDev_Cleanup(void)
 {
-    if (!swdev_registered)
-        return;
+    int my_refCount = wolfSSL_Atomic_Int_SubFetch(&swdev_refCount, 1);
 
-#ifdef WOLF_CRYPTO_CB_FIND
-    wc_CryptoCb_SetDeviceFindCb(NULL);
-#endif
-
-    wc_CryptoCb_UnRegisterDevice(WC_SWDEV_ID);
-    swdev_registered = 0;
+    if (my_refCount == 0) {
+    #ifdef WOLF_CRYPTO_CB_FIND
+        wc_CryptoCb_SetDeviceFindCb(NULL);
+    #endif
+        wc_CryptoCb_UnRegisterDevice(WC_SWDEV_ID);
+    }
+    else if (my_refCount < 0) {
+        /* called more times than Init; restore floor */
+        (void)wolfSSL_Atomic_Int_AddFetch(&swdev_refCount, 1);
+    }
 }
 
 #ifdef WOLF_CRYPTO_CB_FIND