[PATCH] gpio: max732x: add error handling for i2c_new_dummy

[Zhouyang Jia]

When i2c_new_dummy fails, the lack of error-handling code may
cause unexpected results.

This patch adds error-handling code after calling i2c_new_dummy.

Signed-off-by: Zhouyang Jia <jiazhouyan...@gmail.com>
---
 drivers/gpio/gpio-max732x.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/gpio/gpio-max732x.c b/drivers/gpio/gpio-max732x.c
index 9d8bcc6..f03cb0b 100644
--- a/drivers/gpio/gpio-max732x.c
+++ b/drivers/gpio/gpio-max732x.c
@@ -653,6 +653,12 @@ static int max732x_probe(struct i2c_client *client,
                chip->client_group_a = client;
                if (nr_port > 8) {
                        c = i2c_new_dummy(client->adapter, addr_b);
+                       if (!c) {
+                               dev_err(&client->dev,
+                                       "Failed to allocate I2C device\n");
+                               ret = -ENODEV;
+                               goto out_failed;
+                       }
                        chip->client_group_b = chip->client_dummy = c;
                }
                break;
@@ -660,6 +666,12 @@ static int max732x_probe(struct i2c_client *client,
                chip->client_group_b = client;
                if (nr_port > 8) {
                        c = i2c_new_dummy(client->adapter, addr_a);
+                       if (!c) {
+                               dev_err(&client->dev,
+                                       "Failed to allocate I2C device\n");
+                               ret = -ENODEV;
+                               goto out_failed;
+                       }
                        chip->client_group_a = chip->client_dummy = c;
                }
                break;
-- 
2.7.4