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-rw-r--r--kernel/umh.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/kernel/umh.c b/kernel/umh.c
index 7f255b5a8845..11bf5eea474c 100644
--- a/kernel/umh.c
+++ b/kernel/umh.c
@@ -544,6 +544,11 @@ EXPORT_SYMBOL_GPL(fork_usermode_blob);
* Runs a user-space application. The application is started
* asynchronously if wait is not set, and runs as a child of system workqueues.
* (ie. it runs with full root capabilities and optimized affinity).
+ *
+ * Note: successful return value does not guarantee the helper was called at
+ * all. You can't rely on sub_info->{init,cleanup} being called even for
+ * UMH_WAIT_* wait modes as STATIC_USERMODEHELPER_PATH="" turns all helpers
+ * into a successful no-op.
*/
int call_usermodehelper_exec(struct subprocess_info *sub_info, int wait)
{