[PATCH v4 02/16] iio: adc: at91-sama5d2_adc: use cleanup.h for NVMEM buffer

[Varshini Rajendran <varshini.rajendran@microchip.com>]

Use __free(kfree) and __free(nvmem_cell_put) cleanup helpers in
at91_adc_temp_sensor_init() to simplify error handling paths.

Reviewed-by: Andy Shevchenko <andriy.shevchenko@intel.com>
Signed-off-by: Varshini Rajendran <varshini.rajendran@microchip.com>
---
 drivers/iio/adc/at91-sama5d2_adc.c | 33 +++++++++++++-----------------
 1 file changed, 14 insertions(+), 19 deletions(-)

diff --git a/drivers/iio/adc/at91-sama5d2_adc.c b/drivers/iio/adc/at91-sama5d2_adc.c
index e8a5285bb6d4..4a4a25f3c715 100644
--- a/drivers/iio/adc/at91-sama5d2_adc.c
+++ b/drivers/iio/adc/at91-sama5d2_adc.c
@@ -35,6 +35,8 @@
 
 #include <dt-bindings/iio/adc/at91-sama5d2_adc.h>
 
+DEFINE_FREE(nvmem_cell_put, struct nvmem_cell *, if (_T) nvmem_cell_put(_T))
+
 struct at91_adc_reg_layout {
 /* Control Register */
 	u16				CR;
@@ -2249,33 +2251,28 @@ static int at91_adc_temp_sensor_init(struct at91_adc_state *st,
 				     struct device *dev)
 {
 	struct at91_adc_temp_sensor_clb *clb = &st->soc_info.temp_sensor_clb;
-	struct nvmem_cell *temp_calib;
-	u32 *buf;
 	size_t len;
-	int ret = 0;
 
 	if (!st->soc_info.platform->temp_sensor)
 		return 0;
 
 	/* Get the calibration data from NVMEM. */
-	temp_calib = nvmem_cell_get(dev, "temperature_calib");
+	struct nvmem_cell *temp_calib __free(nvmem_cell_put) =
+		nvmem_cell_get(dev, "temperature_calib");
 	if (IS_ERR(temp_calib)) {
-		ret = PTR_ERR(temp_calib);
-		if (ret != -ENOENT)
+		if (PTR_ERR(temp_calib) != -ENOENT)
 			dev_err(dev, "Failed to get temperature_calib cell!\n");
-		return ret;
+		return PTR_ERR(temp_calib);
 	}
 
-	buf = nvmem_cell_read(temp_calib, &len);
-	nvmem_cell_put(temp_calib);
-	if (IS_ERR(buf)) {
-		dev_err(dev, "Failed to read calibration data!\n");
-		return PTR_ERR(buf);
-	}
-	if (len < AT91_ADC_TS_CLB_IDX_MAX * 4) {
+	u32 *buf __free(kfree) = nvmem_cell_read(temp_calib, &len);
+	if (IS_ERR(buf))
+		return dev_err_probe(dev, PTR_ERR(buf),
+				     "Failed to read calibration data!\n");
+
+	if (len < AT91_ADC_TS_CLB_IDX_MAX * sizeof(*buf)) {
 		dev_err(dev, "Invalid calibration data!\n");
-		ret = -EINVAL;
-		goto free_buf;
+		return -EINVAL;
 	}
 
 	/* Store calibration data for later use. */
@@ -2288,9 +2285,7 @@ static int at91_adc_temp_sensor_init(struct at91_adc_state *st,
 	 */
 	clb->p1 = clb->p1 * 1000;
 
-free_buf:
-	kfree(buf);
-	return ret;
+	return 0;
 }
 
 static int at91_adc_probe(struct platform_device *pdev)
-- 
2.34.1