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net: Permit incremental conversion of init functions to Error

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Error reporting for netdev_add is broken: the net_client_init_fun[]
report the actual errors with (at best) error_report(), and their
caller net_client_init1() makes up a generic error on top.

For command line and HMP, this produces an mildly ugly error cascade.

In QMP, the actual errors go to stderr, and the generic error becomes
the command's error reply.

To fix this, we need to convert the net_client_init_fun[] to Error.

To permit fixing them one by one, add an Error ** parameter to the
net_client_init_fun[].  If the call fails without returning an Error,
make up the same generic Error as before.  But if it returns one, use
that instead.  Since none of them does so far, no functional change.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-id: 1431691143-1015-3-git-send-email-armbru@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Markus Armbruster 2015-05-15 13:58:50 +02:00 • committed by Stefan Hajnoczi
parent ca7eb1848b
commit a30ecde6e7
12 changed files with 40 additions and 29 deletions
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3
net/netmap.c
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@ -446,8 +446,9 @@ static NetClientInfo net_netmap_info = {
* ... -net netmap,ifname="..."
*/
int net_init_netmap(const NetClientOptions *opts,
const char *name, NetClientState *peer)
const char *name, NetClientState *peer, Error **errp)
{
/* FIXME error_setg(errp, ...) on failure */
const NetdevNetmapOptions *netmap_opts = opts->netmap;
NetClientState *nc;
NetmapPriv me;