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tracing/probe: Fix to allow user to enable events on unloaded modules

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Fix to allow user to enable probe events on unloaded modules.

This operations was allowed before commit 60d53e2c3b ("tracing/probe:
Split trace_event related data from trace_probe"), because if users
need to probe module init functions, they have to enable those probe
events before loading module.

Link: http://lkml.kernel.org/r/156879693733.31056.9331322616994665167.stgit@devnote2

Cc: stable@vger.kernel.org
Fixes: 60d53e2c3b ("tracing/probe: Split trace_event related data from trace_probe")
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Masami Hiramatsu 2019-09-18 17:55:37 +09:00 committed by Steven Rostedt (VMware)
parent 604e354823
commit 44d00dc7ce
1 changed files with 5 additions and 12 deletions
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17
kernel/trace/trace_kprobe.c
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@ -371,31 +371,24 @@ static int enable_trace_kprobe(struct trace_event_call *call,
if (enabled)
return 0;
enabled = false;
list_for_each_entry(pos, trace_probe_probe_list(tp), list) {
tk = container_of(pos, struct trace_kprobe, tp);
if (trace_kprobe_has_gone(tk))
continue;
ret = __enable_trace_kprobe(tk);
if (ret) {
if (enabled) {
__disable_trace_kprobe(tp);
enabled = false;
}
if (ret)
break;
}
enabled = true;
}
if (!enabled) {
/* No probe is enabled. Roll back */
if (ret) {
/* Failed to enable one of them. Roll back all */
if (enabled)
__disable_trace_kprobe(tp);
if (file)
trace_probe_remove_file(tp, file);
else
trace_probe_clear_flag(tp, TP_FLAG_PROFILE);
if (!ret)
/* Since all probes are gone, this is not available */
ret = -EADDRNOTAVAIL;
}
return ret;