[PATCH i-g-t 4/4] lib/igt_device_scan: Fix scan vs bind/unbind/reload

[Lucas De Marchi]

There's no guarantee a card will end up with the same device node when
modules are loaded/unloaded and drivers bound/unbound. There's some
fundamental issue with the igt's the way it is and it's also puzzling
from the logs it looks like the device vanished from the bus, when in
reality is just the SW state out of sync with what the kernel is
exporting.

Re-scanning when trying to match a device is not expensive compared to
what most tests are doing, so simply force it to occur whenever trying
to match a card.

Example for xe_wedged:

	$ sudo ./build/tests/xe_wedged --device pci:0000:03:00.0 --r wedged-at-any-timeout
	(xe_wedged:11173) drmtest-DEBUG: Looking for devices to open using filter 0: pci:0000:03:00.0
	(xe_wedged:11173) drmtest-DEBUG: Filter matched /dev/dri/card1 | /dev/dri/renderD129

	... [ wedge and rebind here ]

	(xe_wedged:11173) drmtest-DEBUG: Looking for devices to open using filter 0: pci:0000:03:00.0
	(xe_wedged:11173) drmtest-DEBUG: Filter matched /dev/dri/card2 | /dev/dri/renderD130

Signed-off-by: Lucas De Marchi <lucas.demarchi at intel.com>
---
 lib/igt_device_scan.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/igt_device_scan.c b/lib/igt_device_scan.c
index 8e2297087..956719fba 100644
--- a/lib/igt_device_scan.c
+++ b/lib/igt_device_scan.c
@@ -1983,7 +1983,7 @@ static bool __igt_device_card_match(const char *filter,
 	 * Scan devices in case the user hasn't yet,
 	 * but leave a decision on forced rescan on the user side.
 	 */
-	igt_devices_scan(false);
+	igt_devices_scan(true);
 
 	if (igt_device_filter_apply(filter) == false)
 		return false;
-- 
2.47.0