Re: [PATCH net-next] NFC: nci: Extend virtual NCI deinit test

Extend the test to check the scenario when NCI core tries to send data
to already closed device to ensure that nothing bad happens.

Signed-off-by: Dmitry Vyukov <dvyukov@google.com>
Cc: Bongsu Jeon <bongsu.jeon@samsung.com>
Cc: Krzysztof Kozlowski <redacted>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: netdev@vger.kernel.org
---
 tools/testing/selftests/nci/nci_dev.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/tools/testing/selftests/nci/nci_dev.c b/tools/testing/selftests/nci/nci_dev.c
index 162c41e9bcae8..272958a4ad102 100644
--- a/tools/testing/selftests/nci/nci_dev.c
+++ b/tools/testing/selftests/nci/nci_dev.c

@@ -888,6 +888,16 @@ TEST_F(NCI, deinit)
 			   &msg);
 	ASSERT_EQ(rc, 0);
 	EXPECT_EQ(get_dev_enable_state(&msg), 0);
+
+	// Test that operations that normally send packets to the driver
+	// don't cause issues when the device is already closed.
+	// Note: the send of NFC_CMD_DEV_UP itself still succeeds it's just
+	// that the device won't actually be up.
+	close(self->virtual_nci_fd);
+	self->virtual_nci_fd = -1;