[patch net-next] selftests: bpf: don't try to read files without read permission

[Jiri Pirko]

From: Jiri Pirko <j...@mellanox.com>

Recently couple of files that are write only were added to netdevsim
debugfs. Don't read these files and avoid error.

Reported-by: kernel test robot <rong.a.c...@intel.com>
Signed-off-by: Jiri Pirko <j...@mellanox.com>
---
 tools/testing/selftests/bpf/test_offload.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/bpf/test_offload.py 
b/tools/testing/selftests/bpf/test_offload.py
index 15a666329a34..c44c650bde3a 100755
--- a/tools/testing/selftests/bpf/test_offload.py
+++ b/tools/testing/selftests/bpf/test_offload.py
@@ -312,7 +312,7 @@ class DebugfsDir:
             if f == "ports":
                 continue
             p = os.path.join(path, f)
-            if os.path.isfile(p):
+            if os.path.isfile(p) and os.access(p, os.R_OK):
                 _, out = cmd('cat %s/%s' % (path, f))
                 dfs[f] = out.strip()
             elif os.path.isdir(p):
-- 
2.21.0