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 d768f6747961cc206c3c1d14e8e3caaec2e971d9..113493b5214952b2740a9c1f270525572bc07545 100644 (file)
--- 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 {