[Intel-gfx] [i-g-t PATCH v2] tests: do snd_hda_intel unbind before unload in module reload test

[Jani Nikula]

Try to make sure the snd_hda_intel module is not in use, and can be
unloaded.

v2: unbind all cards (Libin)

Cc: Keqiao Zhang <keqiao.zhang at intel.com>
Cc: Libin Yang <libin.yang at intel.com>
Signed-off-by: Jani Nikula <jani.nikula at intel.com>

---

Keqiao, Libin, here's the script this patch is against:

https://cgit.freedesktop.org/drm/igt-gpu-tools/tree/tests/drv_module_reload_basic
---
 tests/drv_module_reload_basic | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/tests/drv_module_reload_basic b/tests/drv_module_reload_basic
index b8cad88133e9..105852a56b46 100755
--- a/tests/drv_module_reload_basic
+++ b/tests/drv_module_reload_basic
@@ -33,6 +33,11 @@ function reload() {
 	pkill alsactl
 	snd_hda_intel_unloaded=0
 	if mod_loaded snd_hda_intel; then
+		# unbind sound cards
+		for card in $(find /sys/bus/pci/drivers/snd_hda_intel -name "0000:*" -printf "%f\n"); do
+			echo $card > /sys/bus/pci/drivers/snd_hda_intel/unbind
+		done
+
 		if rmmod snd_hda_intel; then
 			snd_hda_intel_unloaded=1
 		else
-- 
2.1.4