linux-kernel - [PATCH 3/4] iio: adc: Use devm_krealloc

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Date:   Mon,  6 Mar 2023 15:27:22 +0000
From:   James Clark <james.clark@....com>
To:     linux-kernel@...r.kernel.org
Cc:     James Clark <james.clark@....com>,
        Jonathan Corbet <corbet@....net>,
        Guenter Roeck <linux@...ck-us.net>,
        Jean Delvare <jdelvare@...e.com>,
        Anand Ashok Dumbre <anand.ashok.dumbre@...inx.com>,
        Jonathan Cameron <jic23@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Michal Simek <michal.simek@...inx.com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>, linux-doc@...r.kernel.org,
        linux-hwmon@...r.kernel.org, linux-iio@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-arm-msm@...r.kernel.org, linux-serial@...r.kernel.org
Subject: [PATCH 3/4] iio: adc: Use devm_krealloc_array

Now that it exists, use it instead of doing the multiplication and
checking for overflow manually.

Signed-off-by: James Clark <james.clark@....com>
---
 drivers/iio/adc/xilinx-ams.c       |  9 +++------
 drivers/iio/adc/xilinx-xadc-core.c | 17 +++++++----------
 2 files changed, 10 insertions(+), 16 deletions(-)

diff --git a/drivers/iio/adc/xilinx-ams.c b/drivers/iio/adc/xilinx-ams.c
index 34cf336b3490..f0b71a1220e0 100644
--- a/drivers/iio/adc/xilinx-ams.c
+++ b/drivers/iio/adc/xilinx-ams.c
@@ -1263,7 +1263,7 @@ static int ams_parse_firmware(struct iio_dev *indio_dev)
 	struct device *dev = indio_dev->dev.parent;
 	struct fwnode_handle *child = NULL;
 	struct fwnode_handle *fwnode = dev_fwnode(dev);
-	size_t ams_size, dev_size;
+	size_t ams_size;
 	int ret, ch_cnt = 0, i, rising_off, falling_off;
 	unsigned int num_channels = 0;
 
@@ -1320,11 +1320,8 @@ static int ams_parse_firmware(struct iio_dev *indio_dev)
 		}
 	}
 
-	dev_size = array_size(sizeof(*dev_channels), num_channels);
-	if (dev_size == SIZE_MAX)
-		return -ENOMEM;
-
-	dev_channels = devm_krealloc(dev, ams_channels, dev_size, GFP_KERNEL);
+	dev_channels = devm_krealloc_array(dev, ams_channels, num_channels,
+					   sizeof(*dev_channels), GFP_KERNEL);
 	if (!dev_channels)
 		return -ENOMEM;
 
diff --git a/drivers/iio/adc/xilinx-xadc-core.c b/drivers/iio/adc/xilinx-xadc-core.c
index 292f2892d223..287df3bb951e 100644
--- a/drivers/iio/adc/xilinx-xadc-core.c
+++ b/drivers/iio/adc/xilinx-xadc-core.c
@@ -613,20 +613,17 @@ static int xadc_update_scan_mode(struct iio_dev *indio_dev,
 	const unsigned long *mask)
 {
 	struct xadc *xadc = iio_priv(indio_dev);
-	size_t new_size, n;
+	size_t n;
 	void *data;
 
 	n = bitmap_weight(mask, indio_dev->masklength);
 
-	if (check_mul_overflow(n, sizeof(*xadc->data), &new_size))
-		return -ENOMEM;
-
-	data = devm_krealloc(indio_dev->dev.parent, xadc->data,
-			     new_size, GFP_KERNEL);
+	data = devm_krealloc_array(indio_dev->dev.parent, xadc->data,
+				   n, sizeof(*xadc->data), GFP_KERNEL);
 	if (!data)
 		return -ENOMEM;
 
-	memset(data, 0, new_size);
+	memset(data, 0, n*sizeof(*xadc->data));
 	xadc->data = data;
 
 	return 0;
@@ -1281,9 +1278,9 @@ static int xadc_parse_dt(struct iio_dev *indio_dev, unsigned int *conf, int irq)
 	}
 
 	indio_dev->num_channels = num_channels;
-	indio_dev->channels = devm_krealloc(dev, channels,
-					    sizeof(*channels) * num_channels,
-					    GFP_KERNEL);
+	indio_dev->channels = devm_krealloc_array(dev, channels,
+						  num_channels, sizeof(*channels),
+						  GFP_KERNEL);
 	/* If we can't resize the channels array, just use the original */
 	if (!indio_dev->channels)
 		indio_dev->channels = channels;
-- 
2.34.1