[PATCH] mm: check the return value of ioremap() in macio_init()

[studentxswpy]

From: Xie Shaowen <studentxs...@163.com>

The function ioremap() in macio_init() can fail, so
its return value should be checked.

Fixes: 36874579dbf4c ("[PATCH] powerpc: macio-adb build fix")
Reported-by: Hacash Robot <hacashro...@santino.com>
Signed-off-by: Xie Shaowen <studentxs...@163.com>
---
 drivers/macintosh/macio-adb.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/macintosh/macio-adb.c b/drivers/macintosh/macio-adb.c
index 9b63bd2551c6..cd4e34d15c26 100644
--- a/drivers/macintosh/macio-adb.c
+++ b/drivers/macintosh/macio-adb.c
@@ -108,6 +108,10 @@ int macio_init(void)
                return -ENXIO;
        }
        adb = ioremap(r.start, sizeof(struct adb_regs));
+       if (!adb) {
+               of_node_put(adbs);
+               return -ENOMEM;
+       }
 
        out_8(&adb->ctrl.r, 0);
        out_8(&adb->intr.r, 0);
-- 
2.25.1