soc: Add NULL pointer check in lpi_gpio func

Add NULL pointer check in lpi_gpio func

Change-Id: I974f100dea1c3a72d3231ad7dfc3a118f970996e

soc/pinctrl-lpi.c

@@ -1,7 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * Copyright (c) 2016-2021, The Linux Foundation. All rights reserved.
- * Copyright (c) 2022 Qualcomm Innovation Center, Inc. All rights reserved.
+ * Copyright (c) 2022-2023, Qualcomm Innovation Center, Inc. All rights reserved.
  */
 
 #include <linux/gpio.h>
@@ -150,9 +150,18 @@ int lpi_pinctrl_runtime_suspend(struct device *dev);
 static int lpi_gpio_read(struct lpi_gpio_pad *pad, unsigned int addr)
 {
 	int ret = 0;
-	struct lpi_gpio_state *state = dev_get_drvdata(lpi_dev);
+	struct lpi_gpio_state *state = NULL;
 	static DEFINE_RATELIMIT_STATE(rtl, 1 * HZ, 1);
 
+	if (!lpi_dev) {
+		if (__ratelimit(&rtl))
+			pr_err_ratelimited("%s: lpi_dev is NULL, return\n",
+							__func__);
+		return -EINVAL;
+	}
+
+	state = dev_get_drvdata(lpi_dev);
+
 	if (!lpi_dev_up) {
 		if (__ratelimit(&rtl))
 			pr_err_ratelimited("%s: ADSP is down due to SSR, return\n",
@@ -183,10 +192,19 @@ err:
 static int lpi_gpio_write(struct lpi_gpio_pad *pad, unsigned int addr,
 			  unsigned int val)
 {
-	struct lpi_gpio_state *state = dev_get_drvdata(lpi_dev);
+	struct lpi_gpio_state *state = NULL;
 	int ret = 0;
 	static DEFINE_RATELIMIT_STATE(rtl, 1 * HZ, 1);
 
+	if (!lpi_dev) {
+		if (__ratelimit(&rtl))
+			pr_err_ratelimited("%s: lpi_dev is NULL, return\n",
+							__func__);
+		return -EINVAL;
+	}
+
+	state = dev_get_drvdata(lpi_dev);
+
 	if (!lpi_dev_up) {
 		return 0;
 	}
@@ -549,9 +567,16 @@ static void lpi_pinctrl_ssr_disable(struct device *dev, void *data)
 
 static int lpi_pinctrl_ssr_enable(struct device *dev, void *data)
 {
-	struct lpi_gpio_state *state = dev_get_drvdata(lpi_dev);
+	struct lpi_gpio_state *state = NULL;
 	dev_dbg(dev, "%s: enter\n", __func__);
 
+	if (!lpi_dev) {
+		dev_err(dev, "%s: lpi_dev is NULL, return\n", __func__);
+		return -EINVAL;
+	}
+
+	state = dev_get_drvdata(lpi_dev);
+
 	if (!initial_boot) {
 		trace_printk("%s: enter\n", __func__);
 		if (!lpi_dev_up) {