[PATCH 3/4] HID: alps: Check errors returned by 't4_read_write_register()'

[Christophe JAILLET]

If only the first 't4_read_write_register()' call fails, the error code
will be overwritten and lost.
Directly report the error instead.

While at it, log some errors if 't4_read_write_register()' fails, as done
in the rest of the driver.

Signed-off-by: Christophe JAILLET <christophe.jail...@wanadoo.fr>
---
 drivers/hid/hid-alps.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/hid/hid-alps.c b/drivers/hid/hid-alps.c
index fe8a0624d5e4..137b963779c6 100644
--- a/drivers/hid/hid-alps.c
+++ b/drivers/hid/hid-alps.c
@@ -460,17 +460,35 @@ static int __maybe_unused alps_post_reset(struct 
hid_device *hdev)
        case T4:
                ret = t4_read_write_register(hdev, T4_PRM_FEED_CONFIG_1,
                        NULL, T4_I2C_ABS, false);
+               if (ret < 0) {
+                       dev_err(&hdev->dev, "failed T4_PRM_FEED_CONFIG_1 
(%d)\n",
+                               ret);
+                       goto exit;
+               }
+
                ret = t4_read_write_register(hdev, T4_PRM_FEED_CONFIG_4,
                        NULL, T4_FEEDCFG4_ADVANCED_ABS_ENABLE, false);
+               if (ret < 0) {
+                       dev_err(&hdev->dev, "failed T4_PRM_FEED_CONFIG_4 
(%d)\n",
+                               ret);
+                       goto exit;
+               }
                break;
        case U1:
                ret = u1_read_write_register(hdev,
                        ADDRESS_U1_DEV_CTRL_1, NULL,
                        U1_TP_ABS_MODE | U1_SP_ABS_MODE, false);
+               if (ret < 0) {
+                       dev_err(&hdev->dev, "failed to change TP mode (%d)\n",
+                               ret);
+                       goto exit;
+               }
                break;
        default:
                break;
        }
+
+exit:
        return ret;
 }
 
-- 
2.14.1