You should return early when there are no resources to free:
+int rtnl_link_info(struct interface *iface)
+{
+ int fd, index;
int err, fd, index; (See below for 'err')
+ index = if_nametoindex(iface->name);
+
+ if (index == 0) {
+ pr_err("failed to get interface %s index: %m", iface->name);
return -1;
+ }
+
+ fd = rtnl_open();
+ if (fd < 0)
return fd;
+ if (rtnl_link_query(fd, index))
+ goto no_info;
+ if (rtnl_link_status(fd, NULL, iface->ts_iface))
+ goto no_info;
Here you want to let the error code propagate:
err = rtnl_link_query(fd, index);
if (err) {
goto no_info;
}
err = rtnl_link_status(fd, NULL, iface->ts_iface);
if (err) {
goto no_info;
}
+ /* If we do not have a slave, then use our own interface name
+ * as ts_iface
+ */
+ if (iface->ts_iface[0] == '\0')
+ strncpy(iface->ts_iface, iface->name, MAX_IFNAME_SIZE);
Move these two lines to the call site. They could be place in a
helper function in order to make the purpose clear without a comment.
See below...
no_info:
rtnl_close(fd);
return err;
}
clock.c
~~~~~~~
/*
* If we do not have a slave or the rtnl query failed, then use our
* own interface name as the time stamping interface name.
*/
static void ensure_ts_iface(iface)
{
if (iface->ts_iface[0] == '\0')
strncpy(iface->ts_iface, iface->name, MAX_IFNAME_SIZE);
}
clock_create()
{
STAILQ_FOREACH(iface, &config->interfaces, list) {
rtnl_link_info(iface);
ensure_ts_iface(iface);
...
}
}
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