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[PATCH] kprobes-changed-from-using-spinlock-to-mutex fix

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Based on some feedback from Oleg Nesterov, I have made few changes to
previously posted patch.

Signed-off-by: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Keshavamurthy Anil S
2006-01-09 20:52:44 -08:00
committed by Linus Torvalds
parent 49a2a1b83b
commit f709b12234
3 changed files with 20 additions and 19 deletions
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32
kernel/kprobes.c
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@@ -431,7 +431,7 @@ static int __kprobes register_aggr_kprobe(struct kprobe *old_p,
copy_kprobe(old_p, p);
ret = add_new_kprobe(old_p, p);
} else {
ap = kcalloc(1, sizeof(struct kprobe), GFP_ATOMIC);
ap = kcalloc(1, sizeof(struct kprobe), GFP_KERNEL);
if (!ap)
return -ENOMEM;
add_aggr_kprobe(ap, old_p);
@@ -491,7 +491,8 @@ out:
void __kprobes unregister_kprobe(struct kprobe *p)
{
struct module *mod;
struct kprobe *old_p, *cleanup_p;
struct kprobe *old_p, *list_p;
int cleanup_p;
down(&kprobe_mutex);
old_p = get_kprobe(p->addr);
@@ -499,22 +500,25 @@ void __kprobes unregister_kprobe(struct kprobe *p)
up(&kprobe_mutex);
return;
}
if ((old_p->pre_handler == aggr_pre_handler) &&
if (p != old_p) {
list_for_each_entry_rcu(list_p, &old_p->list, list)
if (list_p == p)
/* kprobe p is a valid probe */
goto valid_p;
up(&kprobe_mutex);
return;
}
valid_p:
if ((old_p == p) || ((old_p->pre_handler == aggr_pre_handler) &&
(p->list.next == &old_p->list) &&
(p->list.prev == &old_p->list)) {
/* Only one element in the aggregate list */
(p->list.prev == &old_p->list))) {
/* Only probe on the hash list */
arch_disarm_kprobe(p);
hlist_del_rcu(&old_p->hlist);
cleanup_p = old_p;
} else if (old_p == p) {
/* Only one kprobe element in the hash list */
arch_disarm_kprobe(p);
hlist_del_rcu(&p->hlist);
cleanup_p = p;
cleanup_p = 1;
} else {
list_del_rcu(&p->list);
cleanup_p = NULL;
cleanup_p = 0;
}
up(&kprobe_mutex);
@@ -524,7 +528,7 @@ void __kprobes unregister_kprobe(struct kprobe *p)
module_put(mod);
if (cleanup_p) {
if (cleanup_p->pre_handler == aggr_pre_handler) {
if (p != old_p) {
list_del_rcu(&p->list);
kfree(old_p);
}