[PATCH v5 2/5] tpm: Return bool from tpm_backend_finish_sync

[Stefan Berger <stefanb@linux.vnet.ibm.com>]

Return true in case we had to wait for an outstanding response
to come back, false otherwise.

Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>

diff --git a/backends/tpm.c b/backends/tpm.c
index 375587e743..1f75883d8a 100644
--- a/backends/tpm.c
+++ b/backends/tpm.c
@@ -49,11 +49,15 @@ static int tpm_backend_worker_thread(gpointer data)
     return 0;
 }
 
-void tpm_backend_finish_sync(TPMBackend *s)
+bool tpm_backend_finish_sync(TPMBackend *s)
 {
+    bool ret = s->cmd != NULL;
+
     while (s->cmd) {
         aio_poll(qemu_get_aio_context(), true);
     }
+
+    return ret;
 }
 
 enum TpmType tpm_backend_get_type(TPMBackend *s)
diff --git a/include/sysemu/tpm_backend.h b/include/sysemu/tpm_backend.h
index 9e7451fb52..c35fe85c62 100644
--- a/include/sysemu/tpm_backend.h
+++ b/include/sysemu/tpm_backend.h
@@ -200,8 +200,10 @@ size_t tpm_backend_get_buffer_size(TPMBackend *s);
  *
  * Finish the pending command synchronously (this will call aio_poll()
  * on qemu main AIOContext until it ends)
+ *
+ * Returns true in case there was a pending command, false otherwise.
  */
-void tpm_backend_finish_sync(TPMBackend *s);
+bool tpm_backend_finish_sync(TPMBackend *s);
 
 /**
  * tpm_backend_query_tpm:
-- 
2.21.0