Re: [PATCH v6] nbd: well form nbd_iter_channel_error errp handler

[Markus Armbruster <armbru@redhat.com>]

Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> writes:

> Make nbd_iter_channel_error errp handler well formed:
> rename local_err to errp_in, as it is IN-parameter here (which is
> unusual for Error**).
>
> Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
> Reviewed-by: Eric Blake <eblake@redhat.com>
> ---
>
> v6: fix commit message
>     add Eric's r-b
>
>  block/nbd.c | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/block/nbd.c b/block/nbd.c
> index 5f18f78a94..345bf902e3 100644
> --- a/block/nbd.c
> +++ b/block/nbd.c
> @@ -864,18 +864,18 @@ typedef struct NBDReplyChunkIter {
>  } NBDReplyChunkIter;
>  
>  static void nbd_iter_channel_error(NBDReplyChunkIter *iter,
> -                                   int ret, Error **local_err)
> +                                   int ret, Error **errp_in)
>  {
> -    assert(ret < 0);
> +    assert(ret < 0 && errp_in && *errp_in);
>  
>      if (!iter->ret) {
>          iter->ret = ret;
> -        error_propagate(&iter->err, *local_err);
> +        error_propagate(&iter->err, *errp_in);
>      } else {
> -        error_free(*local_err);
> +        error_free(*errp_in);
>      }
>  
> -    *local_err = NULL;
> +    *errp_in = NULL;

This one is actually in/out.

If we use the convention

    Any Error ** parameter meant for passing an error to the caller must
    be named @errp.  No other Error ** parameter may be named @errp.

then the old name is as good as the new one.  But the new one's "in"
suggestion is misleading.

>  }
>  
>  static void nbd_iter_request_error(NBDReplyChunkIter *iter, int ret)