linux-kernel - [PATCH 3/5] iio: adc: xilinx: use a devres action to disable and unprepare the clock

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Message-Id: <20201026133609.24262-4-brgl@bgdev.pl>
Date:   Mon, 26 Oct 2020 14:36:07 +0100
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Jonathan Cameron <jic23@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Michal Simek <michal.simek@...inx.com>
Cc:     linux-iio@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: [PATCH 3/5] iio: adc: xilinx: use a devres action to disable and unprepare the clock

From: Bartosz Golaszewski <bgolaszewski@...libre.com>

In order to simplify resource management and error paths in probe(), add
a devm action that calls clk_disable_unprepare() at driver detach.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
---
 drivers/iio/adc/xilinx-xadc-core.c | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/drivers/iio/adc/xilinx-xadc-core.c b/drivers/iio/adc/xilinx-xadc-core.c
index b516280ccbd4..e0da6258092c 100644
--- a/drivers/iio/adc/xilinx-xadc-core.c
+++ b/drivers/iio/adc/xilinx-xadc-core.c
@@ -1185,6 +1185,13 @@ static int xadc_parse_dt(struct iio_dev *indio_dev, struct device_node *np,
 	return 0;
 }
 
+static void xadc_clk_disable_unprepare(void *data)
+{
+	struct clk *clk = data;
+
+	clk_disable_unprepare(clk);
+}
+
 static int xadc_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
@@ -1262,6 +1269,11 @@ static int xadc_probe(struct platform_device *pdev)
 	if (ret)
 		goto err_free_samplerate_trigger;
 
+	ret = devm_add_action_or_reset(dev,
+				       xadc_clk_disable_unprepare, xadc->clk);
+	if (ret)
+		goto err_free_samplerate_trigger;
+
 	/*
 	 * Make sure not to exceed the maximum samplerate since otherwise the
 	 * resulting interrupt storm will soft-lock the system.
@@ -1280,7 +1292,7 @@ static int xadc_probe(struct platform_device *pdev)
 	ret = request_irq(xadc->irq, xadc->ops->interrupt_handler, 0,
 			  dev_name(dev), indio_dev);
 	if (ret)
-		goto err_clk_disable_unprepare;
+		goto err_free_samplerate_trigger;
 
 	ret = xadc->ops->setup(pdev, indio_dev, xadc->irq);
 	if (ret)
@@ -1344,8 +1356,6 @@ static int xadc_probe(struct platform_device *pdev)
 err_free_irq:
 	free_irq(xadc->irq, indio_dev);
 	cancel_delayed_work_sync(&xadc->zynq_unmask_work);
-err_clk_disable_unprepare:
-	clk_disable_unprepare(xadc->clk);
 err_free_samplerate_trigger:
 	if (xadc->ops->flags & XADC_FLAGS_BUFFERED)
 		iio_trigger_free(xadc->samplerate_trigger);
@@ -1372,7 +1382,6 @@ static int xadc_remove(struct platform_device *pdev)
 	}
 	free_irq(xadc->irq, indio_dev);
 	cancel_delayed_work_sync(&xadc->zynq_unmask_work);
-	clk_disable_unprepare(xadc->clk);
 
 	return 0;
 }
-- 
2.29.1