isoc: mediatek: potential use of error pointer

Commit Message

Jiasheng Jiang Dec. 17, 2021, 6:41 a.m. UTC

The return value of devm_clk_get() needs to be checked.
To avoid use of error pointer in case of the failure of alloc.

Fixes: 6078c651947a ("soc: mediatek: Refine scpsys to support multiple platform")
Signed-off-by: Jiasheng Jiang <[e-mail]>
---
 drivers/soc/mediatek/mtk-scpsys.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

Comments

Mark Brown Dec. 17, 2021, 11:27 a.m. UTC | #1

On Fri, Dec 17, 2021 at 02:41:40PM +0800, Jiasheng Jiang wrote:

>  		clk[i] = devm_clk_get(&pdev->dev, clk_names[i]);
> +		if (!clk[i])
> +			return -ENOMEM;

The whole point with returning an error pointer is that there's an error
code in there, we should use that rather than overriding it with another
value which might be misleading.

Patch

diff --git a/drivers/soc/mediatek/mtk-scpsys.c b/drivers/soc/mediatek/mtk-scpsys.c
index ca75b14931ec..778d6ffc42b8 100644
--- a/drivers/soc/mediatek/mtk-scpsys.c
+++ b/drivers/soc/mediatek/mtk-scpsys.c
@@ -411,12 +411,16 @@  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 (!clk[i])
+			return -ENOMEM;
+	}
+	return 0;
 }
 
 static struct scp *init_scp(struct platform_device *pdev,
@@ -426,7 +430,7 @@  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 +485,9 @@  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(-ENOMEM);
 
 	for (i = 0; i < num; i++) {
 		struct scp_domain *scpd = &scp->domains[i];