[PATCH] rtc: rtc-bq4802: add error handling for devm_ioremap

[Zhouyang Jia]

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 <jiazhouyan...@gmail.com>
---
 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 bd170cb..5747a54 100644
--- a/drivers/rtc/rtc-bq4802.c
+++ b/drivers/rtc/rtc-bq4802.c
@@ -164,6 +164,10 @@ 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 {
-- 
2.7.4