Input: tests - add test to cover all input_grab_device() function

Currently input_grab_device() isn't covered by any tests
Thus, adding a test to cover the cases:
1. The device is grabbed successfully
2. Trying to grab a device that is already grabbed by another input
   handle

Signed-off-by: Dana Elfassy <dangel101@gmail.com>
Tested-by: Javier Martinez Canillas <javierm@redhat.com>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Reviewed-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Link: https://lore.kernel.org/r/20230522215514.722564-1-dangel101@gmail.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

diff --git a/drivers/input/tests/input_test.c b/drivers/input/tests/input_test.c
index 0540225f028862cd8c14a3ce592dcddf2666d6e3..2fa5b725ae0a2a86cc8763e2d1d96b37c7f2a7af 100644 (file)
--- a/drivers/input/tests/input_test.c
+++ b/drivers/input/tests/input_test.c
@@ -130,10 +130,42 @@ static void input_test_match_device_id(struct kunit *test)
        KUNIT_ASSERT_FALSE(test, input_match_device_id(input_dev, &id));
 }
 
+static void input_test_grab(struct kunit *test)
+{
+       struct input_dev *input_dev = test->priv;
+       struct input_handle test_handle;
+       struct input_handler handler;
+       struct input_handle handle;
+       struct input_device_id id;
+       int res;
+
+       handler.name = "handler";
+       handler.id_table = &id;
+
+       handle.dev = input_get_device(input_dev);
+       handle.name = dev_name(&input_dev->dev);
+       handle.handler = &handler;
+       res = input_grab_device(&handle);
+       KUNIT_ASSERT_TRUE(test, res == 0);
+
+       test_handle.dev = input_get_device(input_dev);
+       test_handle.name = dev_name(&input_dev->dev);
+       test_handle.handler = &handler;
+       res = input_grab_device(&test_handle);
+       KUNIT_ASSERT_EQ(test, res, -EBUSY);
+
+       input_release_device(&handle);
+       input_put_device(input_dev);
+       res = input_grab_device(&test_handle);
+       KUNIT_ASSERT_TRUE(test, res == 0);
+       input_put_device(input_dev);
+}
+
 static struct kunit_case input_tests[] = {
        KUNIT_CASE(input_test_polling),
        KUNIT_CASE(input_test_timestamp),
        KUNIT_CASE(input_test_match_device_id),
+       KUNIT_CASE(input_test_grab),
        { /* sentinel */ }
 };