linux-kernel - [PATCH v2] isoc: mediatek: Check for error clk pointer

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Message-Id: <20211222015157.1025853-1-jiasheng@iscas.ac.cn>
Date:   Wed, 22 Dec 2021 09:51:57 +0800
From:   Jiasheng Jiang <jiasheng@...as.ac.cn>
To:     matthias.bgg@...il.com, lgirdwood@...il.com, broonie@...nel.org
Cc:     linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Jiasheng Jiang <jiasheng@...as.ac.cn>
Subject: [PATCH v2] isoc: mediatek: Check for error clk pointer

On Wed, Dec 22, 2021 at 01:57:15AM +0800, Mark Brown wrote:
>> +	for (i = CLK_NONE + 1; i < CLK_MAX; i++) {
>>  		clk[i] = devm_clk_get(&pdev->dev, clk_names[i]);
>> +		if (IS_ERR(clk[i]))
>> +			return PTR_ERR(clk[i]);
>
> This now pays attention to the error code here which is good but...
>
>> -	init_clks(pdev, clk);
>> +	ret = init_clks(pdev, clk);
>> +	if (ret)
>> +		return ERR_PTR(-ENOMEM);
>
> ...then discards it here with a random most likely inappropriate error
> code.

Yes, you are right and now the return code depending on the
init_clks().

Fixes: 6078c651947a ("soc: mediatek: Refine scpsys to support multiple platform")
Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
---
Changelog:

v1 -> v2

*Change 1. Change the return code.
---
 drivers/soc/mediatek/mtk-scpsys.c | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/drivers/soc/mediatek/mtk-scpsys.c b/drivers/soc/mediatek/mtk-scpsys.c
index ca75b14931ec..670cc82d17dc 100644
--- a/drivers/soc/mediatek/mtk-scpsys.c
+++ b/drivers/soc/mediatek/mtk-scpsys.c
@@ -411,12 +411,17 @@ static int scpsys_power_off(struct generic_pm_domain *genpd)
 	return ret;
 }
 
-static void init_clks(struct platform_device *pdev, struct clk **clk)
+static int init_clks(struct platform_device *pdev, struct clk **clk)
 {
 	int i;
 
-	for (i = CLK_NONE + 1; i < CLK_MAX; i++)
+	for (i = CLK_NONE + 1; i < CLK_MAX; i++) {
 		clk[i] = devm_clk_get(&pdev->dev, clk_names[i]);
+		if (IS_ERR(clk[i]))
+			return PTR_ERR(clk[i]);
+	}
+
+	return 0;
 }
 
 static struct scp *init_scp(struct platform_device *pdev,
@@ -426,7 +431,7 @@ static struct scp *init_scp(struct platform_device *pdev,
 {
 	struct genpd_onecell_data *pd_data;
 	struct resource *res;
-	int i, j;
+	int i, j, ret;
 	struct scp *scp;
 	struct clk *clk[CLK_MAX];
 
@@ -481,7 +486,9 @@ static struct scp *init_scp(struct platform_device *pdev,
 
 	pd_data->num_domains = num;
 
-	init_clks(pdev, clk);
+	ret = init_clks(pdev, clk);
+	if (ret)
+		return ERR_PTR(ret);
 
 	for (i = 0; i < num; i++) {
 		struct scp_domain *scpd = &scp->domains[i];
-- 
2.25.1