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Message-ID: <1531912331-26431-4-git-send-email-manish.narani@xilinx.com>
Date: Wed, 18 Jul 2018 16:42:10 +0530
From: Manish Narani <manish.narani@...inx.com>
To: <jic23@...nel.org>, <knaack.h@....de>, <lars@...afoo.de>,
<pmeerw@...erw.net>, <michal.simek@...inx.com>,
<manish.narani@...inx.com>, <linux-iio@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-kernel@...r.kernel.org>
CC: <anirudh@...inx.com>, <sgoud@...inx.com>
Subject: [PATCH 3/4] 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 | 24 ++++++++++++++++++++++--
1 file changed, 22 insertions(+), 2 deletions(-)
diff --git a/drivers/iio/adc/xilinx-xadc-core.c b/drivers/iio/adc/xilinx-xadc-core.c
index 248cffa..47eb364 100644
--- a/drivers/iio/adc/xilinx-xadc-core.c
+++ b/drivers/iio/adc/xilinx-xadc-core.c
@@ -322,6 +322,7 @@ static irqreturn_t xadc_zynq_interrupt_handler(int irq, void *devid)
#define XADC_ZYNQ_TCK_RATE_MAX 50000000
#define XADC_ZYNQ_IGAP_DEFAULT 20
+#define XADC_ZYNQ_PCAP_RATE_MAX 200000000
static int xadc_zynq_setup(struct platform_device *pdev,
struct iio_dev *indio_dev, int irq)
@@ -332,6 +333,7 @@ static int xadc_zynq_setup(struct platform_device *pdev,
unsigned int div;
unsigned int igap;
unsigned int tck_rate;
+ int ret;
/* TODO: Figure out how to make igap and tck_rate configurable */
igap = XADC_ZYNQ_IGAP_DEFAULT;
@@ -341,6 +343,13 @@ static int xadc_zynq_setup(struct platform_device *pdev,
pcap_rate = clk_get_rate(xadc->clk);
+ if (pcap_rate > XADC_ZYNQ_PCAP_RATE_MAX) {
+ ret = clk_set_rate(xadc->clk,
+ (unsigned long)XADC_ZYNQ_PCAP_RATE_MAX);
+ if (ret)
+ return ret;
+ }
+
if (tck_rate > pcap_rate / 2) {
div = 2;
} else {
@@ -366,6 +375,12 @@ static int xadc_zynq_setup(struct platform_device *pdev,
XADC_ZYNQ_CFG_REDGE | XADC_ZYNQ_CFG_WEDGE |
tck_div | XADC_ZYNQ_CFG_IGAP(igap));
+ if (pcap_rate > XADC_ZYNQ_PCAP_RATE_MAX) {
+ ret = clk_set_rate(xadc->clk, pcap_rate);
+ if (ret)
+ return ret;
+ }
+
return 0;
}
@@ -887,6 +902,9 @@ 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;
@@ -1239,8 +1257,10 @@ 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
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