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From:   Xu Wang <vulab@iscas.ac.cn>
To:     jic23@kernel.org, lars@metafoo.de, pmeerw@pmeerw.net,
        mcoquelin.stm32@gmail.com, alexandre.torgue@st.com,
        fabrice.gasnier@st.com, krzk@kernel.org, andy.shevchenko@gmail.com,
        olivier.moysan@st.com, etienne.carriere@st.com,
        alexandru.ardelean@analog.com, peter.ujfalusi@ti.com,
        linux-iio@vger.kernel.org,
        linux-stm32@st-md-mailman.stormreply.com,
        linux-arm-kernel@lists.infradead.org
Cc:     linux-kernel@vger.kernel.org
Subject: [PATCH] iio: adc: stm32-adc: Remove redundant null check before clk_prepare_enable/clk_disable_unprepare
Date:   Fri, 18 Dec 2020 09:35:12 +0000
Message-Id: <20201218093512.871-1-vulab@iscas.ac.cn>
Precedence: bulk

Because clk_prepare_enable() and clk_disable_unprepare() already checked
NULL clock parameter, so the additional checks are unnecessary, just
remove them.

Signed-off-by: Xu Wang <vulab@iscas.ac.cn>
---
 drivers/iio/adc/stm32-adc-core.c | 29 +++++++++++------------------
 drivers/iio/adc/stm32-adc.c      | 14 +++++---------
 2 files changed, 16 insertions(+), 27 deletions(-)

diff --git a/drivers/iio/adc/stm32-adc-core.c b/drivers/iio/adc/stm32-adc-core.c
index 9d1ad6e38e85..c088cb990193 100644
--- a/drivers/iio/adc/stm32-adc-core.c
+++ b/drivers/iio/adc/stm32-adc-core.c
@@ -535,20 +535,16 @@ static int stm32_adc_core_hw_start(struct device *dev)
 		goto err_switches_dis;
 	}
 
-	if (priv->bclk) {
-		ret = clk_prepare_enable(priv->bclk);
-		if (ret < 0) {
-			dev_err(dev, "bus clk enable failed\n");
-			goto err_regulator_disable;
-		}
+	ret = clk_prepare_enable(priv->bclk);
+	if (ret < 0) {
+		dev_err(dev, "bus clk enable failed\n");
+		goto err_regulator_disable;
 	}
 
-	if (priv->aclk) {
-		ret = clk_prepare_enable(priv->aclk);
-		if (ret < 0) {
-			dev_err(dev, "adc clk enable failed\n");
-			goto err_bclk_disable;
-		}
+	ret = clk_prepare_enable(priv->aclk);
+	if (ret < 0) {
+		dev_err(dev, "adc clk enable failed\n");
+		goto err_bclk_disable;
 	}
 
 	writel_relaxed(priv->ccr_bak, priv->common.base + priv->cfg->regs->ccr);
@@ -556,8 +552,7 @@ static int stm32_adc_core_hw_start(struct device *dev)
 	return 0;
 
 err_bclk_disable:
-	if (priv->bclk)
-		clk_disable_unprepare(priv->bclk);
+	clk_disable_unprepare(priv->bclk);
 err_regulator_disable:
 	regulator_disable(priv->vref);
 err_switches_dis:
@@ -575,10 +570,8 @@ static void stm32_adc_core_hw_stop(struct device *dev)
 
 	/* Backup CCR that may be lost (depends on power state to achieve) */
 	priv->ccr_bak = readl_relaxed(priv->common.base + priv->cfg->regs->ccr);
-	if (priv->aclk)
-		clk_disable_unprepare(priv->aclk);
-	if (priv->bclk)
-		clk_disable_unprepare(priv->bclk);
+	clk_disable_unprepare(priv->aclk);
+	clk_disable_unprepare(priv->bclk);
 	regulator_disable(priv->vref);
 	stm32_adc_core_switches_supply_dis(priv);
 	regulator_disable(priv->vdda);
diff --git a/drivers/iio/adc/stm32-adc.c b/drivers/iio/adc/stm32-adc.c
index c067c994dae2..f7c53cea509a 100644
--- a/drivers/iio/adc/stm32-adc.c
+++ b/drivers/iio/adc/stm32-adc.c
@@ -546,8 +546,7 @@ static int stm32_adc_hw_stop(struct device *dev)
 	if (adc->cfg->unprepare)
 		adc->cfg->unprepare(indio_dev);
 
-	if (adc->clk)
-		clk_disable_unprepare(adc->clk);
+	clk_disable_unprepare(adc->clk);
 
 	return 0;
 }
@@ -558,11 +557,9 @@ static int stm32_adc_hw_start(struct device *dev)
 	struct stm32_adc *adc = iio_priv(indio_dev);
 	int ret;
 
-	if (adc->clk) {
-		ret = clk_prepare_enable(adc->clk);
-		if (ret)
-			return ret;
-	}
+	ret = clk_prepare_enable(adc->clk);
+	if (ret)
+		return ret;
 
 	stm32_adc_set_res(adc);
 
@@ -575,8 +572,7 @@ static int stm32_adc_hw_start(struct device *dev)
 	return 0;
 
 err_clk_dis:
-	if (adc->clk)
-		clk_disable_unprepare(adc->clk);
+	clk_disable_unprepare(adc->clk);
 
 	return ret;
 }
-- 
2.17.1