media: platform: stm32: unprepare clocks at handling errors in probe

[ Upstream commit 055d2db ]

stm32_cec_probe() did not unprepare clocks on error handling paths. The
patch fixes that.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Evgeny Novikov <novikov@ispras.ru>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

drivers/media/cec/platform/stm32/stm32-cec.c

@@ -305,14 +305,16 @@ static int stm32_cec_probe(struct platform_device *pdev)
 
 	cec->clk_hdmi_cec = devm_clk_get(&pdev->dev, "hdmi-cec");
 	if (IS_ERR(cec->clk_hdmi_cec) &&
-	    PTR_ERR(cec->clk_hdmi_cec) == -EPROBE_DEFER)
-		return -EPROBE_DEFER;
+	    PTR_ERR(cec->clk_hdmi_cec) == -EPROBE_DEFER) {
+		ret = -EPROBE_DEFER;
+		goto err_unprepare_cec_clk;
+	}
 
 	if (!IS_ERR(cec->clk_hdmi_cec)) {
 		ret = clk_prepare(cec->clk_hdmi_cec);
 		if (ret) {
 			dev_err(&pdev->dev, "Can't prepare hdmi-cec clock\n");
-			return ret;
+			goto err_unprepare_cec_clk;
 		}
 	}
 
@@ -324,19 +326,27 @@ static int stm32_cec_probe(struct platform_device *pdev)
 			CEC_NAME, caps,	CEC_MAX_LOG_ADDRS);
 	ret = PTR_ERR_OR_ZERO(cec->adap);
 	if (ret)
-		return ret;
+		goto err_unprepare_hdmi_cec_clk;
 
 	ret = cec_register_adapter(cec->adap, &pdev->dev);
-	if (ret) {
-		cec_delete_adapter(cec->adap);
-		return ret;
-	}
+	if (ret)
+		goto err_delete_adapter;
 
 	cec_hw_init(cec);
 
 	platform_set_drvdata(pdev, cec);
 
 	return 0;
+
+err_delete_adapter:
+	cec_delete_adapter(cec->adap);
+
+err_unprepare_hdmi_cec_clk:
+	clk_unprepare(cec->clk_hdmi_cec);
+
+err_unprepare_cec_clk:
+	clk_unprepare(cec->clk_cec);
+	return ret;
 }
 
 static int stm32_cec_remove(struct platform_device *pdev)