macintosh/macio-adb: check the return value of ioremap()

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 <hacashRobot@santino.com>
Signed-off-by: Xie Shaowen <studentxswpy@163.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220802074148.3213659-1-studentxswpy@163.com

diff --git a/drivers/macintosh/macio-adb.c b/drivers/macintosh/macio-adb.c
index 3721402582b4fc9422bdd85619e830638fbb8120..55a9f8c3a150e1433edb7384ea9474c4137a4aad 100644 (file)
--- 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);