netdev - [PATCH net 1/3] tools: ynl-gen: fix single attribute structs with attr 0 only

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Message-Id: <20230223183141.1422857-2-kuba@kernel.org>
Date:   Thu, 23 Feb 2023 10:31:39 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     davem@...emloft.net
Cc:     netdev@...r.kernel.org, edumazet@...gle.com, pabeni@...hat.com,
        Jakub Kicinski <kuba@...nel.org>,
        Chuck Lever III <chuck.lever@...cle.com>
Subject: [PATCH net 1/3] tools: ynl-gen: fix single attribute structs with attr 0 only

Chuck run into an issue with a single-element attr-set which
only has an attr with value of 0. The search for max attr in
a struct records attrs with value larger than 0 only (max_val
is set to 0 at the start). Adjust the comparison, alternatively
max_val could be init'ed to -1. Somehow picking the last attr
of a value seems like a good idea in general.

Reported-by: Chuck Lever III <chuck.lever@...cle.com>
Fixes: be5bea1cc0bf ("net: add basic C code generators for Netlink")
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
---
 tools/net/ynl/ynl-gen-c.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/net/ynl/ynl-gen-c.py b/tools/net/ynl/ynl-gen-c.py
index 3942f24b9163..274e9c566f61 100755
--- a/tools/net/ynl/ynl-gen-c.py
+++ b/tools/net/ynl/ynl-gen-c.py
@@ -546,7 +546,7 @@ from lib import SpecFamily, SpecAttrSet, SpecAttr, SpecOperation
         max_val = 0
         self.attr_max_val = None
         for name, attr in self.attr_list:
-            if attr.value > max_val:
+            if attr.value >= max_val:
                 max_val = attr.value
                 self.attr_max_val = attr
             self.attrs[name] = attr
-- 
2.39.2