mfd: qcom_rpm: Fix an error handling path in qcom_rpm_probe()

[ Upstream commit 36579ac ]

If an error occurs after the clk_prepare_enable() call, a corresponding
clk_disable_unprepare() should be called.

Simplify code and switch to devm_clk_get_enabled() to fix it.

Fixes: 3526403 ("mfd: qcom_rpm: Handle message RAM clock")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Lee Jones <lee@kernel.org>
Link: https://lore.kernel.org/r/e39752476d02605b2be46cab7115f71255ce13a8.1668949256.git.christophe.jaillet@wanadoo.fr
Signed-off-by: Sasha Levin <sashal@kernel.org>

drivers/mfd/qcom_rpm.c

@@ -547,7 +547,7 @@ static int qcom_rpm_probe(struct platform_device *pdev)
 	init_completion(&rpm->ack);
 
 	/* Enable message RAM clock */
-	rpm->ramclk = devm_clk_get(&pdev->dev, "ram");
+	rpm->ramclk = devm_clk_get_enabled(&pdev->dev, "ram");
 	if (IS_ERR(rpm->ramclk)) {
 		ret = PTR_ERR(rpm->ramclk);
 		if (ret == -EPROBE_DEFER)
@@ -558,7 +558,6 @@ static int qcom_rpm_probe(struct platform_device *pdev)
 		 */
 		rpm->ramclk = NULL;
 	}
-	clk_prepare_enable(rpm->ramclk); /* Accepts NULL */
 
 	irq_ack = platform_get_irq_byname(pdev, "ack");
 	if (irq_ack < 0)
@@ -681,7 +680,6 @@ static int qcom_rpm_remove(struct platform_device *pdev)
 	struct qcom_rpm *rpm = dev_get_drvdata(&pdev->dev);
 
 	of_platform_depopulate(&pdev->dev);
-	clk_disable_unprepare(rpm->ramclk);
 
 	return 0;
 }