[igt-dev] [PATCH i-g-t] lib/kmod: Recursively unload the modules

[Chris Wilson]

When asked to unload a module, look at all the modules that are
trying to use the module and try to unload those first.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 lib/igt_kmod.c | 21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/lib/igt_kmod.c b/lib/igt_kmod.c
index e701545d3..5778bf953 100644
--- a/lib/igt_kmod.c
+++ b/lib/igt_kmod.c
@@ -243,6 +243,25 @@ out:
 	return err < 0 ? err : 0;
 }
 
+static int kmod_unload_r(struct kmod_module *kmod, unsigned int flags)
+{
+	struct kmod_list *holders, *pos;
+	int err = 0;
+
+	holders = kmod_module_get_holders(kmod);
+	kmod_list_foreach(pos, holders) {
+		struct kmod_module *it = kmod_module_get_module(pos);
+		err = kmod_unload_r(it, flags);
+		kmod_module_unref(it);
+		if (err < 0)
+			break;
+	}
+	kmod_module_unref_list(holders);
+	if (err < 0)
+		return err;
+
+	return kmod_module_remove_module(kmod, flags);
+}
 
 /**
  * igt_kmod_unload:
@@ -269,7 +288,7 @@ igt_kmod_unload(const char *mod_name, unsigned int flags)
 		goto out;
 	}
 
-	err = kmod_module_remove_module(kmod, flags);
+	err = kmod_unload_r(kmod, flags);
 	if (err < 0) {
 		igt_debug("Could not remove module %s (%s)\n", mod_name,
 			  strerror(-err));
-- 
2.29.2