linux-kernel - [LINUX PATCH V3 8/9] gpio: gpio-xilinx: Check return value of of_property_read

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Date:   Thu, 12 Nov 2020 22:42:27 +0530
From:   Srinivas Neeli <srinivas.neeli@...inx.com>
To:     <linus.walleij@...aro.org>, <bgolaszewski@...libre.com>,
        <michal.simek@...inx.com>, <shubhrajyoti.datta@...inx.com>,
        <sgoud@...inx.com>, <hancock@...systems.ca>
CC:     <linux-gpio@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <git@...inx.com>,
        Srinivas Neeli <srinivas.neeli@...inx.com>
Subject: [LINUX PATCH V3 8/9] gpio: gpio-xilinx: Check return value of of_property_read_u32

In two different instances the return value of "of_property_read_u32"
API was neither captured nor checked.
Fixed it by capturing the return value and then checking for any error.

Addresses-Coverity: "check_return"
Signed-off-by: Srinivas Neeli <srinivas.neeli@...inx.com>
---
Changes in V3:
-Created new patch to fix coverity warnings.
---
 drivers/gpio/gpio-xilinx.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/gpio/gpio-xilinx.c b/drivers/gpio/gpio-xilinx.c
index 48f2a6c894f5..8a5f0a0265e6 100644
--- a/drivers/gpio/gpio-xilinx.c
+++ b/drivers/gpio/gpio-xilinx.c
@@ -569,7 +569,8 @@ static int xgpio_probe(struct platform_device *pdev)
 	platform_set_drvdata(pdev, chip);
 
 	/* Update GPIO state shadow register with default value */
-	of_property_read_u32(np, "xlnx,dout-default", &chip->gpio_state[0]);
+	if (of_property_read_u32(np, "xlnx,dout-default", &chip->gpio_state[0]))
+		chip->gpio_state[0] = 0x0;
 
 	/* Update GPIO direction shadow register with default value */
 	if (of_property_read_u32(np, "xlnx,tri-default", &chip->gpio_dir[0]))
@@ -593,8 +594,9 @@ static int xgpio_probe(struct platform_device *pdev)
 
 	if (is_dual) {
 		/* Update GPIO state shadow register with default value */
-		of_property_read_u32(np, "xlnx,dout-default-2",
-				     &chip->gpio_state[1]);
+		if (of_property_read_u32(np, "xlnx,dout-default-2",
+					 &chip->gpio_state[1]))
+			chip->gpio_state[1] = 0x0;
 
 		/* Update GPIO direction shadow register with default value */
 		if (of_property_read_u32(np, "xlnx,tri-default-2",
-- 
2.7.4