Re: [PATCH 35/52] migration/rdma: Convert qemu_rdma_exchange_send() to Error

[Zhijian Li (Fujitsu)]

On 18/09/2023 22:41, Markus Armbruster wrote:
> Functions that use an Error **errp parameter to return errors should
> not also report them to the user, because reporting is the caller's
> job.  When the caller does, the error is reported twice.  When it
> doesn't (because it recovered from the error), there is no error to
> report, i.e. the report is bogus.
> 
> qio_channel_rdma_writev() violates this principle: it calls
> error_report() via qemu_rdma_exchange_send().  I elected not to
> investigate how callers handle the error, i.e. precise impact is not
> known.
> 
> Clean this up by converting qemu_rdma_exchange_send() to Error.
> 
> Necessitates setting an error when qemu_rdma_post_recv_control(),
> callback(), or qemu_rdma_exchange_get_response() failed.  Since these
> errors will go away later in this series, simply use "FIXME temporary
> error message" there.
> 
> Signed-off-by: Markus Armbruster<armbru@redhat.com>

Reviewed-by: Li Zhijian <lizhijian@fujitsu.com>