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authorIngo Molnar <mingo@elte.hu>2008-11-10 09:16:27 +0100
committerIngo Molnar <mingo@elte.hu>2008-11-10 09:16:27 +0100
commit4ecd33d930591d41fe356160593a9076467b961c (patch)
treeb9051a334540bbce38db1b2b03cebb4cf1d51f73 /kernel/tracepoint.c
parent7d5a78cd98c3a5eb83bd6a061c5ea6ef1e9b8fcb (diff)
parentf7160c7573615ec82c691e294cf80d920b5d588d (diff)
Merge commit 'v2.6.28-rc4' into x86/apic
Diffstat (limited to 'kernel/tracepoint.c')
-rw-r--r--kernel/tracepoint.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/kernel/tracepoint.c b/kernel/tracepoint.c
index f2b7c28a4708..af8c85664882 100644
--- a/kernel/tracepoint.c
+++ b/kernel/tracepoint.c
@@ -131,6 +131,9 @@ tracepoint_entry_remove_probe(struct tracepoint_entry *entry, void *probe)
old = entry->funcs;
+ if (!old)
+ return NULL;
+
debug_print_probes(entry);
/* (N -> M), (N > 1, M >= 0) probes */
for (nr_probes = 0; old[nr_probes]; nr_probes++) {
@@ -388,6 +391,11 @@ int tracepoint_probe_unregister(const char *name, void *probe)
if (entry->rcu_pending)
rcu_barrier_sched();
old = tracepoint_entry_remove_probe(entry, probe);
+ if (!old) {
+ printk(KERN_WARNING "Warning: Trying to unregister a probe"
+ "that doesn't exist\n");
+ goto end;
+ }
mutex_unlock(&tracepoints_mutex);
tracepoint_update_probes(); /* may update entry */
mutex_lock(&tracepoints_mutex);