rtc: bq4802: add error handling for devm_ioremap
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>
diff --git a/drivers/rtc/rtc-bq4802.c b/drivers/rtc/rtc-bq4802.c
index d768f67..113493b 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 {