jump label: Fix error with preempt disable holding mutex

[pandora-kernel.git] / kernel / kprobes.c

diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index 9437e14..9737a76 100644 (file)
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -1145,17 +1145,13 @@ int __kprobes register_kprobe(struct kprobe *p)
        if (ret)
                return ret;
 
-       preempt_disable();
        jump_label_lock();
+       preempt_disable();
        if (!kernel_text_address((unsigned long) p->addr) ||
            in_kprobes_functions((unsigned long) p->addr) ||
            ftrace_text_reserved(p->addr, p->addr) ||
-           jump_label_text_reserved(p->addr, p->addr)) {
-               preempt_enable();
-               jump_label_unlock();
-               return -EINVAL;
-       }
-       jump_label_unlock();
+           jump_label_text_reserved(p->addr, p->addr))
+               goto fail_with_jump_label;
 
        /* User can pass only KPROBE_FLAG_DISABLED to register_kprobe */
        p->flags &= KPROBE_FLAG_DISABLED;
@@ -1169,10 +1165,9 @@ int __kprobes register_kprobe(struct kprobe *p)
                 * We must hold a refcount of the probed module while updating
                 * its code to prohibit unexpected unloading.
                 */
-               if (unlikely(!try_module_get(probed_mod))) {
-                       preempt_enable();
-                       return -EINVAL;
-               }
+               if (unlikely(!try_module_get(probed_mod)))
+                       goto fail_with_jump_label;
+
                /*
                 * If the module freed .init.text, we couldn't insert
                 * kprobes in there.
@@ -1180,11 +1175,11 @@ int __kprobes register_kprobe(struct kprobe *p)
                if (within_module_init((unsigned long)p->addr, probed_mod) &&
                    probed_mod->state != MODULE_STATE_COMING) {
                        module_put(probed_mod);
-                       preempt_enable();
-                       return -EINVAL;
+                       goto fail_with_jump_label;
                }
        }
        preempt_enable();
+       jump_label_unlock();
 
        p->nmissed = 0;
        INIT_LIST_HEAD(&p->list);
@@ -1226,6 +1221,11 @@ out:
                module_put(probed_mod);
 
        return ret;
+
+fail_with_jump_label:
+       preempt_enable();
+       jump_label_unlock();
+       return -EINVAL;
 }
 EXPORT_SYMBOL_GPL(register_kprobe);