linux-kernel - [PATCH 5/5] net: qcom/emac: Prevent device_find_child() from modifying caller's match data

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Message-Id: <20240811-const_dfc_prepare-v1-5-d67cc416b3d3@quicinc.com>
Date: Sun, 11 Aug 2024 08:18:11 +0800
From: Zijun Hu <zijun_hu@...oud.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 "Rafael J. Wysocki" <rafael@...nel.org>, 
 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>, 
 Takashi Sakamoto <o-takashi@...amocchi.jp>, Timur Tabi <timur@...nel.org>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>
Cc: Zijun Hu <zijun_hu@...oud.com>, linux-kernel@...r.kernel.org, 
 linux-cxl@...r.kernel.org, linux1394-devel@...ts.sourceforge.net, 
 netdev@...r.kernel.org, Zijun Hu <quic_zijuhu@...cinc.com>
Subject: [PATCH 5/5] net: qcom/emac: Prevent device_find_child() from
 modifying caller's match data

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

It does not make sense for emac_sgmii_acpi_match() as device_find_child()'s
match function to modify caller's match data, fixed by using
constify_device_find_child_helper() instead of device_find_child().

Signed-off-by: Zijun Hu <quic_zijuhu@...cinc.com>
---
 drivers/net/ethernet/qualcomm/emac/emac-sgmii.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/qualcomm/emac/emac-sgmii.c b/drivers/net/ethernet/qualcomm/emac/emac-sgmii.c
index e4bc18009d08..e53065756a1d 100644
--- a/drivers/net/ethernet/qualcomm/emac/emac-sgmii.c
+++ b/drivers/net/ethernet/qualcomm/emac/emac-sgmii.c
@@ -358,8 +358,9 @@ int emac_sgmii_config(struct platform_device *pdev, struct emac_adapter *adpt)
 	if (has_acpi_companion(&pdev->dev)) {
 		struct device *dev;

-		dev = device_find_child(&pdev->dev, &phy->sgmii_ops,
-					emac_sgmii_acpi_match);
+		dev = constify_device_find_child_helper(&pdev->dev,
+							&phy->sgmii_ops,
+							emac_sgmii_acpi_match);

 		if (!dev) {
 			dev_warn(&pdev->dev, "cannot find internal phy node\n");

-- 
2.34.1