linux-kernel - [PATCH v2 1/4] iio: adc: xilinx: Check for return values in clk related functions

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Date:   Mon, 23 Jul 2018 20:32:00 +0530
From:   Manish Narani <manish.narani@...inx.com>
To:     <lakshmi.sai.krishna.potthuri@...inx.com>,
        <manish.narani@...inx.com>, <michal.simek@...inx.com>,
        <pmeerw@...erw.net>, <lars@...afoo.de>, <knaack.h@....de>,
        <jic23@...nel.org>
CC:     <anirudh@...inx.com>, <sgoud@...inx.com>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <linux-iio@...r.kernel.org>
Subject: [PATCH v2 1/4] iio: adc: xilinx: Check for return values in clk related functions

This patch adds check for return values from clock related functions.
This was reported by static code analysis tool.

Signed-off-by: Manish Narani <manish.narani@...inx.com>
---
 drivers/iio/adc/xilinx-xadc-core.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/iio/adc/xilinx-xadc-core.c b/drivers/iio/adc/xilinx-xadc-core.c
index 0127e85..23395fc 100644
--- a/drivers/iio/adc/xilinx-xadc-core.c
+++ b/drivers/iio/adc/xilinx-xadc-core.c
@@ -340,6 +340,8 @@ static int xadc_zynq_setup(struct platform_device *pdev,
 	xadc->zynq_intmask = ~0;
 
 	pcap_rate = clk_get_rate(xadc->clk);
+	if (!pcap_rate)
+		return -EINVAL;
 
 	if (tck_rate > pcap_rate / 2) {
 		div = 2;
@@ -887,6 +889,9 @@ static int xadc_write_raw(struct iio_dev *indio_dev,
 	unsigned long clk_rate = xadc_get_dclk_rate(xadc);
 	unsigned int div;
 
+	if (!clk_rate)
+		return -EINVAL;
+
 	if (info != IIO_CHAN_INFO_SAMP_FREQ)
 		return -EINVAL;
 
@@ -1237,8 +1242,10 @@ static int xadc_probe(struct platform_device *pdev)
 		goto err_free_irq;
 
 	/* Disable all alarms */
-	xadc_update_adc_reg(xadc, XADC_REG_CONF1, XADC_CONF1_ALARM_MASK,
-		XADC_CONF1_ALARM_MASK);
+	ret = xadc_update_adc_reg(xadc, XADC_REG_CONF1, XADC_CONF1_ALARM_MASK,
+				  XADC_CONF1_ALARM_MASK);
+	if (ret)
+		goto err_free_irq;
 
 	/* Set thresholds to min/max */
 	for (i = 0; i < 16; i++) {
-- 
2.1.1