tracing: fix oops in tracepoint_update_probe_range()
Change this crash: BUG: unable to handle kernel NULL pointer dereference at (null) IP: [<ffffffff8107d4de>] tracepoint_update_probe_range+0x1f/0x9b PGD 13d5fb067 PUD 13d688067 PMD 0 Oops: 0000 [#1] SMP To a more debuggable WARN_ONCE(). Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Steven Rostedt <rostedt@goodmis.org> LKML-Reference: <1237394936.3132.1.camel@localhost.localdomain> [ moved the check outside the lock and added a WARN_ON(). ] Signed-off-by: Ingo Molnar <mingo@elte.hu>
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@ -272,12 +272,17 @@ static void disable_tracepoint(struct tracepoint *elem)
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*
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* Updates the probe callback corresponding to a range of tracepoints.
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*/
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void tracepoint_update_probe_range(struct tracepoint *begin,
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struct tracepoint *end)
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void
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tracepoint_update_probe_range(struct tracepoint *begin, struct tracepoint *end)
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{
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struct tracepoint *iter;
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struct tracepoint_entry *mark_entry;
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if (!begin) {
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WARN_ON_ONCE(1);
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return;
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}
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mutex_lock(&tracepoints_mutex);
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for (iter = begin; iter < end; iter++) {
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mark_entry = get_tracepoint(iter->name);
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