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Subject[PATCH 3/3] module: Properly propagate MODULE_STATE_COMING failure
Now that notifiers got unbroken; use the proper interface to handle
notifier errors and propagate them.

There were already MODULE_STATE_COMING notifiers that failed; notably:

- jump_label_module_notifier()
- tracepoint_module_notify()
- bpf_event_notify()

By propagating this error, we fix those users.

Cc: Jessica Yu <jeyu@kernel.org>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Martin KaFai Lau <kafai@fb.com>
Cc: Song Liu <songliubraving@fb.com>
Cc: Yonghong Song <yhs@fb.com>
Cc: linux-kernel@vger.kernel.org
Cc: netdev@vger.kernel.org
Cc: bpf@vger.kernel.org
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
kernel/module.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)

--- a/kernel/module.c
+++ b/kernel/module.c
@@ -3643,9 +3643,10 @@ static int prepare_coming_module(struct
if (err)
return err;

- blocking_notifier_call_chain(&module_notify_list,
- MODULE_STATE_COMING, mod);
- return 0;
+ err = blocking_notifier_call_chain_error(&module_notify_list,
+ MODULE_STATE_COMING, MODULE_STATE_GOING, mod);
+
+ return notifier_to_errno(err);
}

static int unknown_module_param_cb(char *param, char *val, const char *modname,

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