diff options
Diffstat (limited to 'kernel/tracepoint.c')
| -rw-r--r-- | kernel/tracepoint.c | 27 |
1 files changed, 15 insertions, 12 deletions
diff --git a/kernel/tracepoint.c b/kernel/tracepoint.c index d96ba22dabf..29f26540e9c 100644 --- a/kernel/tracepoint.c +++ b/kernel/tracepoint.c @@ -112,7 +112,8 @@ tracepoint_entry_add_probe(struct tracepoint_entry *entry, int nr_probes = 0; struct tracepoint_func *old, *new; - WARN_ON(!probe); + if (WARN_ON(!probe)) + return ERR_PTR(-EINVAL); debug_print_probes(entry); old = entry->funcs; @@ -152,13 +153,18 @@ tracepoint_entry_remove_probe(struct tracepoint_entry *entry, debug_print_probes(entry); /* (N -> M), (N > 1, M >= 0) probes */ - for (nr_probes = 0; old[nr_probes].func; nr_probes++) { - if (!probe || - (old[nr_probes].func == probe && - old[nr_probes].data == data)) - nr_del++; + if (probe) { + for (nr_probes = 0; old[nr_probes].func; nr_probes++) { + if (old[nr_probes].func == probe && + old[nr_probes].data == data) + nr_del++; + } } + /* + * If probe is NULL, then nr_probes = nr_del = 0, and then the + * entire entry will be removed. + */ if (nr_probes - nr_del == 0) { /* N -> 0, (N > 1) */ entry->funcs = NULL; @@ -173,8 +179,7 @@ tracepoint_entry_remove_probe(struct tracepoint_entry *entry, if (new == NULL) return ERR_PTR(-ENOMEM); for (i = 0; old[i].func; i++) - if (probe && - (old[i].func != probe || old[i].data != data)) + if (old[i].func != probe || old[i].data != data) new[j++] = old[i]; new[nr_probes - nr_del].func = NULL; entry->refcount = nr_probes - nr_del; @@ -192,12 +197,11 @@ tracepoint_entry_remove_probe(struct tracepoint_entry *entry, static struct tracepoint_entry *get_tracepoint(const char *name) { struct hlist_head *head; - struct hlist_node *node; struct tracepoint_entry *e; u32 hash = jhash(name, strlen(name), 0); head = &tracepoint_table[hash & (TRACEPOINT_TABLE_SIZE - 1)]; - hlist_for_each_entry(e, node, head, hlist) { + hlist_for_each_entry(e, head, hlist) { if (!strcmp(name, e->name)) return e; } @@ -211,13 +215,12 @@ static struct tracepoint_entry *get_tracepoint(const char *name) static struct tracepoint_entry *add_tracepoint(const char *name) { struct hlist_head *head; - struct hlist_node *node; struct tracepoint_entry *e; size_t name_len = strlen(name) + 1; u32 hash = jhash(name, name_len-1, 0); head = &tracepoint_table[hash & (TRACEPOINT_TABLE_SIZE - 1)]; - hlist_for_each_entry(e, node, head, hlist) { + hlist_for_each_entry(e, head, hlist) { if (!strcmp(name, e->name)) { printk(KERN_NOTICE "tracepoint %s busy\n", name); |