From 7874b919866ba91bac253fa219d3d4c82bb944df Mon Sep 17 00:00:00 2001
From: Zhouyang Jia <jiazhouyang09@gmail.com>
Date: Tue, 12 Jun 2018 12:40:03 +0800
Subject: [PATCH] rtc: bq4802: add error handling for devm_ioremap
Git-commit: 7874b919866ba91bac253fa219d3d4c82bb944df
Patch-mainline: v4.19-rc1
References: bsc#1051510

When devm_ioremap fails, the lack of error-handling code may
cause unexpected results.

This patch adds error-handling code after calling devm_ioremap.

Signed-off-by: Zhouyang Jia <jiazhouyang09@gmail.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/rtc/rtc-bq4802.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/rtc/rtc-bq4802.c b/drivers/rtc/rtc-bq4802.c
index d768f6747961..113493b52149 100644
--- a/drivers/rtc/rtc-bq4802.c
+++ b/drivers/rtc/rtc-bq4802.c
@@ -162,6 +162,10 @@ static int bq4802_probe(struct platform_device *pdev)
 	} else if (p->r->flags & IORESOURCE_MEM) {
 		p->regs = devm_ioremap(&pdev->dev, p->r->start,
 					resource_size(p->r));
+		if (!p->regs){
+			err = -ENOMEM;
+			goto out;
+		}
 		p->read = bq4802_read_mem;
 		p->write = bq4802_write_mem;
 	} else {
-- 
2.18.0