Re: [PATCH 1/7] migration/rdma: Fix save_page method to fail on polling error

["Zhijian Li (Fujitsu)" <lizhijian@xxxxxxxxxxx>]

On 31/08/2023 21:25, Markus Armbruster wrote:
> qemu_rdma_save_page() reports polling error with error_report(), then
> succeeds anyway.  This is because the variable holding the polling
> status *shadows* the variable the function returns.  The latter
> remains zero.
> 
> Broken since day one, and duplicated more recently.
> 
> Fixes: 2da776db4846 (rdma: core logic)
> Fixes: b390afd8c50b (migration/rdma: Fix out of order wrid)

Thanks for the fixes


> Signed-off-by: Markus Armbruster <armbru@xxxxxxxxxx>


Reviewed-by: Li Zhijian <lizhijian@xxxxxxxxxxx>




> ---
>   migration/rdma.c | 6 ++++--
>   1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/migration/rdma.c b/migration/rdma.c
> index ca430d319d..b2e869aced 100644
> --- a/migration/rdma.c
> +++ b/migration/rdma.c
> @@ -3281,7 +3281,8 @@ static size_t qemu_rdma_save_page(QEMUFile *f,
>        */
>       while (1) {
>           uint64_t wr_id, wr_id_in;
> -        int ret = qemu_rdma_poll(rdma, rdma->recv_cq, &wr_id_in, NULL);
> +        ret = qemu_rdma_poll(rdma, rdma->recv_cq, &wr_id_in, NULL);
> +
>           if (ret < 0) {
>               error_report("rdma migration: polling error! %d", ret);
>               goto err;
> @@ -3296,7 +3297,8 @@ static size_t qemu_rdma_save_page(QEMUFile *f,
>   
>       while (1) {
>           uint64_t wr_id, wr_id_in;
> -        int ret = qemu_rdma_poll(rdma, rdma->send_cq, &wr_id_in, NULL);
> +        ret = qemu_rdma_poll(rdma, rdma->send_cq, &wr_id_in, NULL);
> +
>           if (ret < 0) {
>               error_report("rdma migration: polling error! %d", ret);
>               goto err;