[igt-dev] [PATCH i-g-t 2/2] tests/core_hotunplug: Always check device health after late close

[Janusz Krzysztofik <janusz.krzysztofik@linux.intel.com>]

Subtests hotrebind and hotreplug perform post-operation device healthcheck
while keeping an old instance of the device still open.  If that
healthcheck succeeds, the subtest deliberately returns success, without
closing that old device instance first, so potential issues when closing
it don't contribute to those subtests' results (we have dedicated subtests
-- hotrebind-lateclose and hotreplug-lateclose -- focused on that step).
Next, recover() function called from a follow-up igt_fixture section only
closes the old device, without re-checking whether the new device is still
healthy thereafter.  As a consequence, next tasks may be executed in an
insane environment.

Teach recover() to perform additional healthckech right after device close
if preceding subtest succeeded but left the device open.  Since next
recovery steps can recognize potential failure of that healthcheck by
non-NULL error message passed back, safely ignore the healtheck return
value.

Signed-off-by: Janusz Krzysztofik <janusz.krzysztofik@linux.intel.com>
---
 tests/core_hotunplug.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/tests/core_hotunplug.c b/tests/core_hotunplug.c
index 68fd92238c..ebb646b50f 100644
--- a/tests/core_hotunplug.c
+++ b/tests/core_hotunplug.c
@@ -463,8 +463,13 @@ static void pre_check(struct hotunplug *priv)
 
 static void recover(struct hotunplug *priv)
 {
+	bool late_close = priv->fd.drm >= 0;
+
 	cleanup(priv);
 
+	if (!priv->failure && late_close)
+		igt_ignore_warn(healthcheck(priv, false));
+
 	/* unbind the driver from a possibly hot rebound unhealthy device */
 	if (!faccessat(priv->fd.sysfs_drv, priv->dev_bus_addr, F_OK, 0) &&
 	    priv->fd.drm == -1 && priv->fd.drm_hc == -1 && priv->failure)
-- 
2.25.1