[igt-dev] [PATCH i-g-t] testdisplay: Don't double-close udev fd

[Petri Latvala]

testdisplay uses GIO for polling the udev fd for events. When shutting
down, both the GIO channel and libudev want to close their respective
fds, leading to a double close.

Since version 240 (as used by Ubuntu 19.04), libudev has complained
loudly if close() fails with EBADF. Previously the error has flown
under the radar.

Calling g_io_channel_shutdown() will call close() on the fd regardless
of g_io_channel_set_close_on_unref, so opencode the flush and unref
instead to avoid double closing.

Signed-off-by: Petri Latvala <petri.latvala at intel.com>
Cc: Jani Saarinen <jani.saarinen at intel.com>
Cc: Arkadiusz Hiler <arkadiusz.hiler at intel.com>
---
 tests/testdisplay_hotplug.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/tests/testdisplay_hotplug.c b/tests/testdisplay_hotplug.c
index 581d987e..cd784895 100644
--- a/tests/testdisplay_hotplug.c
+++ b/tests/testdisplay_hotplug.c
@@ -117,8 +117,10 @@ out:
 
 void testdisplay_cleanup_hotplug(void)
 {
-	if (udevchannel)
-		g_io_channel_shutdown(udevchannel, TRUE, NULL);
+	if (udevchannel) {
+		g_io_channel_flush(udevchannel, NULL);
+		g_io_channel_unref(udevchannel);
+	}
 	if (uevent_monitor)
 		udev_monitor_unref(uevent_monitor);
 	if (udev)
-- 
2.19.1