If we are woken up from while() loop in nbd_read_reply_entry
handles must be equal. If we are woken up from
nbd_recv_coroutines_wake_all s->quit must be true, so we do
not need checking handles equality.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
---
 block/nbd-client.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/block/nbd-client.c b/block/nbd-client.c
index acd8e5d007..486bfff9f7 100644
--- a/block/nbd-client.c
+++ b/block/nbd-client.c
@@ -189,9 +189,10 @@ static int nbd_co_receive_reply(NBDClientSession *s,
     s->requests[i].receiving = true;
     qemu_coroutine_yield();
     s->requests[i].receiving = false;
-    if (s->reply.handle != request->handle || !s->ioc || s->quit) {
+    if (!s->ioc || s->quit) {
         ret = -EIO;
     } else {
+        assert(s->reply.handle == request->handle);
         ret = -s->reply.error;
         if (qiov && s->reply.error == 0) {
             assert(request->len == iov_size(qiov->iov, qiov->niov));
-- 
2.11.1

On 09/20/2017 07:45 AM, Vladimir Sementsov-Ogievskiy wrote:
> If we are woken up from while() loop in nbd_read_reply_entry
> handles must be equal. If we are woken up from
> nbd_recv_coroutines_wake_all s->quit must be true, so we do
> not need checking handles equality.
> 
> Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
> ---
>  block/nbd-client.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)

Reviewed-by: Eric Blake <eblake@redhat.com>

> 
> diff --git a/block/nbd-client.c b/block/nbd-client.c
> index acd8e5d007..486bfff9f7 100644
> --- a/block/nbd-client.c
> +++ b/block/nbd-client.c
> @@ -189,9 +189,10 @@ static int nbd_co_receive_reply(NBDClientSession *s,
>      s->requests[i].receiving = true;
>      qemu_coroutine_yield();
>      s->requests[i].receiving = false;
> -    if (s->reply.handle != request->handle || !s->ioc || s->quit) {
> +    if (!s->ioc || s->quit) {
>          ret = -EIO;
>      } else {
> +        assert(s->reply.handle == request->handle);
>          ret = -s->reply.error;
>          if (qiov && s->reply.error == 0) {
>              assert(request->len == iov_size(qiov->iov, qiov->niov));
> 

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
Virtualization:  qemu.org | libvirt.org