From e5ecfb7289cd9675333a5d2c1c39fd6f2c55706e Mon Sep 17 00:00:00 2001
From: Simon Xue <xxm@rock-chips.com>
Date: Mon, 10 Feb 2025 11:24:39 +0800
Subject: [PATCH] iio: adc: rockchip_saradc: fix crash cause by saradc

fix the crash caused by interrupt occurring before info->last_chan is ready

Change-Id: I6a57d49d5af6fb35708e009c33422ad936af0d3f
Signed-off-by: Simon Xue <xxm@rock-chips.com>
---
 drivers/iio/adc/rockchip_saradc.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/iio/adc/rockchip_saradc.c b/drivers/iio/adc/rockchip_saradc.c
index f1050ef5fb05..a0091aaaf0f1 100644
--- a/drivers/iio/adc/rockchip_saradc.c
+++ b/drivers/iio/adc/rockchip_saradc.c
@@ -229,6 +229,10 @@ static irqreturn_t rockchip_saradc_isr(int irq, void *dev_id)
 	unsigned long flags;
 #endif
 
+	/* Nothing need to do if info->last_chan not ready */
+	if (!info->last_chan)
+		return IRQ_HANDLED;
+
 	/* Read value */
 	info->last_val = rockchip_saradc_read(info);
 #ifndef CONFIG_ROCKCHIP_SARADC_TEST_CHN