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module: Properly propagate MODULE_STATE_COMING failure

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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.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Miroslav Benes <mbenes@suse.cz>
Acked-by: Jessica Yu <jeyu@kernel.org>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Link: https://lore.kernel.org/r/20200818135804.444372853@infradead.org
This commit is contained in:
Peter Zijlstra 2020-08-18 15:57:38 +02:00 committed by Ingo Molnar
parent 0340a6b7fb
commit 59cc8e0a90
1 changed files with 7 additions and 3 deletions
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10
kernel/module.c
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@ -3792,9 +3792,13 @@ static int prepare_coming_module(struct module *mod)
if (err)
return err;
blocking_notifier_call_chain(&module_notify_list,
MODULE_STATE_COMING, mod);
return 0;
err = blocking_notifier_call_chain_robust(&module_notify_list,
MODULE_STATE_COMING, MODULE_STATE_GOING, mod);
err = notifier_to_errno(err);
if (err)
klp_module_going(mod);
return err;
}
static int unknown_module_param_cb(char *param, char *val, const char *modname,