block/nbd-client: don't check ioc

We have several paranoid checks for ioc != NULL. But ioc may become
NULL only on close, which should not happen during requests handling.
Also, we check ioc only sometimes, not after each yield, which is
inconsistent. Let's drop these checks. However, for safety, let's leave
asserts instead.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-Id: <20190201130138.94525-6-vsementsov@virtuozzo.com>
Signed-off-by: Eric Blake <eblake@redhat.com>

diff --git a/block/nbd-client.c b/block/nbd-client.c
index 65e5600..386c3fe 100644 (file)
--- a/block/nbd-client.c
+++ b/block/nbd-client.c
@@ -53,9 +53,7 @@ static void nbd_teardown_connection(BlockDriverState *bs)
 {
     NBDClientSession *client = nbd_get_client_session(bs);
 
-    if (!client->ioc) { /* Already closed */
-        return;
-    }
+    assert(client->ioc);
 
     /* finish any pending coroutines */
     qio_channel_shutdown(client->ioc,
@@ -154,10 +152,7 @@ static int nbd_co_send_request(BlockDriverState *bs,
         rc = -EIO;
         goto err;
     }
-    if (!s->ioc) {
-        rc = -EPIPE;
-        goto err;
-    }
+    assert(s->ioc);
 
     if (qiov) {
         qio_channel_set_cork(s->ioc, true);
@@ -429,10 +424,11 @@ static coroutine_fn int nbd_co_do_receive_one_chunk(
     s->requests[i].receiving = true;
     qemu_coroutine_yield();
     s->requests[i].receiving = false;
-    if (!s->ioc || s->quit) {
+    if (s->quit) {
         error_setg(errp, "Connection closed");
         return -EIO;
     }
+    assert(s->ioc);
 
     assert(s->reply.handle == handle);
 
@@ -982,9 +978,7 @@ void nbd_client_close(BlockDriverState *bs)
     NBDClientSession *client = nbd_get_client_session(bs);
     NBDRequest request = { .type = NBD_CMD_DISC };
 
-    if (client->ioc == NULL) {
-        return;
-    }
+    assert(client->ioc);
 
     nbd_send_request(client->ioc, &request);