linux-kernel - [PATCH v6 5/8] driver core: Correct parameter check for API device_for_each_child_reverse

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Message-Id: <20250105-class_fix-v6-5-3a2f1768d4d4@quicinc.com>
Date: Sun, 05 Jan 2025 16:34:06 +0800
From: Zijun Hu <zijun_hu@...oud.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: "Rafael J. Wysocki" <rafael@...nel.org>, Tejun Heo <tj@...nel.org>, 
 Josef Bacik <josef@...icpanda.com>, Jens Axboe <axboe@...nel.dk>, 
 Boris Burkov <boris@....io>, Davidlohr Bueso <dave@...olabs.net>, 
 Jonathan Cameron <jonathan.cameron@...wei.com>, 
 Dave Jiang <dave.jiang@...el.com>, 
 Alison Schofield <alison.schofield@...el.com>, 
 Vishal Verma <vishal.l.verma@...el.com>, Ira Weiny <ira.weiny@...el.com>, 
 Dan Williams <dan.j.williams@...el.com>, Danilo Krummrich <dakr@...nel.org>, 
 Zijun Hu <zijun_hu@...oud.com>, linux-kernel@...r.kernel.org, 
 cgroups@...r.kernel.org, linux-block@...r.kernel.org, 
 linux-cxl@...r.kernel.org, Zijun Hu <quic_zijuhu@...cinc.com>, 
 Jonathan Cameron <Jonathan.Cameron@...wei.com>
Subject: [PATCH v6 5/8] driver core: Correct parameter check for API
 device_for_each_child_reverse_from()

From: Zijun Hu <quic_zijuhu@...cinc.com>

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@...wei.com>
Signed-off-by: Zijun Hu <quic_zijuhu@...cinc.com>
---
 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