linux-kernel - [PATCH 2/2] clk: imx: clk-imx8mp: add error handling of of_clk_add_hw

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Date:   Mon, 24 Apr 2023 09:24:10 +0000
From:   Yuxing Liu <lyx2022@...t.edu.cn>
To:     Abel Vesa <abelvesa@...nel.org>, Peng Fan <peng.fan@....com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>
Cc:     hust-os-kernel-patches@...glegroups.com,
        Yuxing Liu <lyx2022@...t.edu.cn>,
        Dongliang Mu <dzm91@...t.edu.cn>, linux-clk@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] clk: imx: clk-imx8mp: add error handling of of_clk_add_hw_provider

Referring to clk-imx8mq.c, check the return code of of_clk_add_hw_provider,
if it returns negtive, print error info and unregister hws,
which makes the program more robust.

Signed-off-by: Yuxing Liu <lyx2022@...t.edu.cn>
Reviewed-by: Dongliang Mu <dzm91@...t.edu.cn>
---
This patch is untested on real device.
---
 drivers/clk/imx/clk-imx8mp.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/imx/clk-imx8mp.c b/drivers/clk/imx/clk-imx8mp.c
index 353d58b665f9..de7d2d2176be 100644
--- a/drivers/clk/imx/clk-imx8mp.c
+++ b/drivers/clk/imx/clk-imx8mp.c
@@ -414,6 +414,7 @@ static int imx8mp_clocks_probe(struct platform_device *pdev)
 	struct device *dev = &pdev->dev;
 	struct device_node *np;
 	void __iomem *anatop_base, *ccm_base;
+	int err;
 
 	np = of_find_compatible_node(NULL, NULL, "fsl,imx8mp-anatop");
 	anatop_base = devm_of_iomap(dev, np, 0, NULL);
@@ -717,7 +718,12 @@ static int imx8mp_clocks_probe(struct platform_device *pdev)
 
 	imx_check_clk_hws(hws, IMX8MP_CLK_END);
 
-	of_clk_add_hw_provider(np, of_clk_hw_onecell_get, clk_hw_data);
+	err = of_clk_add_hw_provider(np, of_clk_hw_onecell_get, clk_hw_data);
+	if (err < 0) {
+		dev_err(dev, "failed to register hws for i.MX8MP\n");
+		imx_unregister_hw_clocks(hws, IMX8MP_CLK_END);
+		return err;
+	}
 
 	imx_register_uart_clocks();
 
-- 
2.34.1