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Re: [libvirt] [PATCH 3/4] util: Adjust the #ifdef logic in virNetDevBridgeCreate



On Wed, Jun 28, 2017 at 07:37:37 -0400, John Ferlan wrote:
> Commit id 'adf846d3' added many ATTRIBUTE_FALLTHROUGH; statements;
> however, this particular one caught the eye of the Coverity checker
> which notes that the statement isn't reachable when the # if is true.
> 
> While it could be considered a false positive, just add an # else in
> order to make it more obvious.
> 
> Signed-off-by: John Ferlan <jferlan redhat com>
> ---

I think this is a cleaner solution, since it gets rid of that weird
swtich statement altogether:

diff --git a/src/util/virnetdevbridge.c b/src/util/virnetdevbridge.c
index 11b03b426..cfb7ebae9 100644
--- a/src/util/virnetdevbridge.c
+++ b/src/util/virnetdevbridge.c
@@ -468,22 +468,17 @@ virNetDevBridgeCreate(const char *brname)
         if (resp->nlmsg_len < NLMSG_LENGTH(sizeof(*err)))
             goto malformed_resp;

-        switch (err->error) {
-        case 0:
-            break;
-        case -EOPNOTSUPP:
+        if (err->error < 0) {
 # if defined(HAVE_STRUCT_IFREQ) && defined(SIOCBRADDBR)
-            /* fallback to ioctl if netlink doesn't support creating
-             * bridges
-             */
-            rc = virNetDevBridgeCreateWithIoctl(brname);
-            goto cleanup;
+            if (err->error == -EOPNOTSUPP) {
+                /* fallback to ioctl if netlink doesn't support creating
+                 * bridges
+                 */
+                rc = virNetDevBridgeCreateWithIoctl(brname);
+                goto cleanup;
+            }
 # endif
-            /* intentionally fall through if virNetDevBridgeCreateWithIoctl()
-             * isn't available.
-             */
-            ATTRIBUTE_FALLTHROUGH;
-        default:
+
             virReportSystemError(-err->error,
                                  _("error creating bridge interface %s"),
                                  brname);


I'll send it as a formal patch if you agree.

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