[PATCH 6.1 013/197] of: unittest: Fix compile in the non-dynamic case

Greg Kroah-Hartman
2024-02-20T21:00:07Z

From: Christian A. Ehrhardt <lk@c--e.de>

[ Upstream commit 607aad1e4356c210dbef9022955a3089377909b2 ]

If CONFIG_OF_KOBJ is not set, a device_node does not contain a
kobj and attempts to access the embedded kobj via kref_read break
the compile.

Replace affected kref_read calls with a macro that reads the
refcount if it exists and returns 1 if there is no embedded kobj.

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202401291740.VP219WIz-lkp@intel.com/
Fixes: 4dde83569832 ("of: Fix double free in of_parse_phandle_with_args_map")
Signed-off-by: Christian A. Ehrhardt <lk@c--e.de>
Link: https://lore.kernel.org/r/20240129192556.403271-1-lk@c--e.de
Signed-off-by: Rob Herring <robh@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/of/unittest.c | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/of/unittest.c b/drivers/of/unittest.c
index e541a8960f1d..ce1386074e66 100644
--- a/drivers/of/unittest.c
+++ b/drivers/of/unittest.c
@@ -49,6 +49,12 @@ static struct unittest_results {
failed; \
})

+#ifdef CONFIG_OF_KOBJ
+#define OF_KREF_READ(NODE) kref_read(&(NODE)->kobj.kref)
+#else
+#define OF_KREF_READ(NODE) 1
+#endif
+
/*
* Expected message may have a message level other than KERN_INFO.
* Print the expected message only if the current loglevel will allow
@@ -562,7 +568,7 @@ static void __init of_unittest_parse_phandle_with_args_map(void)
pr_err("missing testcase data\n");
return;
}
- prefs[i] = kref_read(&p[i]->kobj.kref);
+ prefs[i] = OF_KREF_READ(p[i]);
}

rc = of_count_phandle_with_args(np, "phandle-list", "#phandle-cells");
@@ -685,9 +691,9 @@ static void __init of_unittest_parse_phandle_with_args_map(void)
unittest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);

for (i = 0; i < ARRAY_SIZE(p); ++i) {
- unittest(prefs[i] == kref_read(&p[i]->kobj.kref),
+ unittest(prefs[i] == OF_KREF_READ(p[i]),
"provider%d: expected:%d got:%d\n",
- i, prefs[i], kref_read(&p[i]->kobj.kref));
+ i, prefs[i], OF_KREF_READ(p[i]));
of_node_put(p[i]);
}
}
--
2.43.0