1 files changed, 9 insertions, 1 deletions

diff --git a/drivers/hid/hid-magicmouse.c b/drivers/hid/hid-magicmouse.c
index 318cc40df92d..82f0c3d741f2 100644
--- a/drivers/hid/hid-magicmouse.c
+++ b/drivers/hid/hid-magicmouse.c
@@ -499,9 +499,17 @@ static int magicmouse_probe(struct hid_device *hdev,
         }
         report->size = 6;
 
+        /*
+         * The device reponds with 'invalid report id' when feature
+         * report switching it into multitouch mode is sent to it.
+         *
+         * This results in -EIO from the _raw low-level transport callback,
+         * but there seems to be no other way of switching the mode.
+         * Thus the super-ugly hacky success check below.
+         */
         ret = hdev->hid_output_raw_report(hdev, feature, sizeof(feature),
                         HID_FEATURE_REPORT);
-        if (ret != sizeof(feature)) {
+        if (ret != -EIO) {
                 hid_err(hdev, "unable to request touch data (%d)\n", ret);
                 goto err_stop_hw;
         }