[PATCH v6 5/8] driver core: Correct parameter check for API device_for_each_child_reverse_from()

[Zijun Hu]

From: Zijun Hu <quic_zijuhu@xxxxxxxxxxx>

device_for_each_child_reverse_from() checks (!parent->p) for its
parameter @parent, and that is not consistent with other APIs of
its cluster as shown below:

device_for_each_child_reverse_from() // check (!parent->p)
device_for_each_child_reverse()      // check (!parent || !parent->p)
device_for_each_child()              // same above
device_find_child()                  // same above

Correct the API's parameter @parent check by (!parent || !parent->p).

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Signed-off-by: Zijun Hu <quic_zijuhu@xxxxxxxxxxx>
---
 drivers/base/core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/base/core.c b/drivers/base/core.c
index a83a1350fb5b2baa5e4ee0f5e5805a5bee536ec7..d3800f0dc5bbd2a7de80bd58b50e31038265da03 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -4050,7 +4050,7 @@ int device_for_each_child_reverse_from(struct device *parent,
 	struct device *child;
 	int error = 0;
 
-	if (!parent->p)
+	if (!parent || !parent->p)
 		return 0;
 
 	klist_iter_init_node(&parent->p->klist_children, &i,

-- 
2.34.1