[PATCH] powerpc/smp: parse_thread_groups() return error on missing property

[PATCH] powerpc/smp: parse_thread_groups() return error on missing property

[John Ogness]

parse_thread_groups() is supposed to return -EINVAL if the property
does not exist and -ENODATA if property does not have a value.
However, it is currently assuming it exists and blindly calling
kzalloc_objs() with whatever of_property_count_u32_elems() returns.

Since of_property_count_u32_elems() returns exactly these same error
values in those cases, simply return with the returned error value.

Signed-off-by: John Ogness <john.ogness@linutronix.de>
---
 arch/powerpc/kernel/smp.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
index 7a25eaa59e626..58824f5f4c800 100644
--- a/arch/powerpc/kernel/smp.c
+++ b/arch/powerpc/kernel/smp.c
@@ -824,6 +824,8 @@ static int parse_thread_groups(struct device_node *dn,
 	int i = 0;
 
 	count = of_property_count_u32_elems(dn, "ibm,thread-groups");
+	if (count < 0)
+		return count;
 	thread_group_array = kzalloc_objs(u32, count);
 	if (!thread_group_array)
 		return -ENOMEM;
-- 
2.47.3