diff options
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/trace/ftrace.c | 59 |
1 files changed, 32 insertions, 27 deletions
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c index 827f2fe7bc3f..cacf0856191e 100644 --- a/kernel/trace/ftrace.c +++ b/kernel/trace/ftrace.c @@ -2656,28 +2656,26 @@ ftrace_regex_open(struct ftrace_ops *ops, int flag, return -ENOMEM; } + iter->ops = ops; + iter->flags = flag; + + mutex_lock(&ops->regex_lock); + if (flag & FTRACE_ITER_NOTRACE) hash = ops->notrace_hash; else hash = ops->filter_hash; - iter->ops = ops; - iter->flags = flag; - if (file->f_mode & FMODE_WRITE) { - mutex_lock(&ftrace_lock); iter->hash = alloc_and_copy_ftrace_hash(FTRACE_HASH_DEFAULT_BITS, hash); - mutex_unlock(&ftrace_lock); - if (!iter->hash) { trace_parser_put(&iter->parser); kfree(iter); - return -ENOMEM; + ret = -ENOMEM; + goto out_unlock; } } - mutex_lock(&ops->regex_lock); - if ((file->f_mode & FMODE_WRITE) && (file->f_flags & O_TRUNC)) ftrace_filter_reset(iter->hash); @@ -2697,6 +2695,8 @@ ftrace_regex_open(struct ftrace_ops *ops, int flag, } } else file->private_data = iter; + + out_unlock: mutex_unlock(&ops->regex_lock); return ret; @@ -3012,7 +3012,7 @@ register_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops, if (WARN_ON(not)) return -EINVAL; - mutex_lock(&ftrace_lock); + mutex_lock(&trace_probe_ops.regex_lock); hash = alloc_and_copy_ftrace_hash(FTRACE_HASH_DEFAULT_BITS, *orig_hash); if (!hash) { @@ -3070,14 +3070,16 @@ register_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops, } while_for_each_ftrace_rec(); + mutex_lock(&ftrace_lock); ret = ftrace_hash_move(&trace_probe_ops, 1, orig_hash, hash); if (ret < 0) count = ret; __enable_ftrace_function_probe(); + mutex_unlock(&ftrace_lock); out_unlock: - mutex_unlock(&ftrace_lock); + mutex_unlock(&trace_probe_ops.regex_lock); free_ftrace_hash(hash); return count; @@ -3117,7 +3119,7 @@ __unregister_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops, return; } - mutex_lock(&ftrace_lock); + mutex_lock(&trace_probe_ops.regex_lock); hash = alloc_and_copy_ftrace_hash(FTRACE_HASH_DEFAULT_BITS, *orig_hash); if (!hash) @@ -3155,6 +3157,7 @@ __unregister_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops, list_add(&entry->free_list, &free_list); } } + mutex_lock(&ftrace_lock); __disable_ftrace_function_probe(); /* * Remove after the disable is called. Otherwise, if the last @@ -3166,9 +3169,10 @@ __unregister_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops, list_del(&entry->free_list); ftrace_free_entry(entry); } + mutex_unlock(&ftrace_lock); out_unlock: - mutex_unlock(&ftrace_lock); + mutex_unlock(&trace_probe_ops.regex_lock); free_ftrace_hash(hash); } @@ -3284,11 +3288,10 @@ ftrace_regex_write(struct file *file, const char __user *ubuf, } else iter = file->private_data; - mutex_lock(&iter->ops->regex_lock); - - ret = -ENODEV; if (unlikely(ftrace_disabled)) - goto out_unlock; + return -ENODEV; + + /* iter->hash is a local copy, so we don't need regex_lock */ parser = &iter->parser; read = trace_get_user(parser, ubuf, cnt, ppos); @@ -3299,13 +3302,11 @@ ftrace_regex_write(struct file *file, const char __user *ubuf, parser->idx, enable); trace_parser_clear(parser); if (ret < 0) - goto out_unlock; + goto out; } ret = read; -out_unlock: - mutex_unlock(&iter->ops->regex_lock); - + out: return ret; } @@ -3357,16 +3358,19 @@ ftrace_set_hash(struct ftrace_ops *ops, unsigned char *buf, int len, if (unlikely(ftrace_disabled)) return -ENODEV; + mutex_lock(&ops->regex_lock); + if (enable) orig_hash = &ops->filter_hash; else orig_hash = &ops->notrace_hash; hash = alloc_and_copy_ftrace_hash(FTRACE_HASH_DEFAULT_BITS, *orig_hash); - if (!hash) - return -ENOMEM; + if (!hash) { + ret = -ENOMEM; + goto out_regex_unlock; + } - mutex_lock(&ops->regex_lock); if (reset) ftrace_filter_reset(hash); if (buf && !ftrace_match_records(hash, buf, len)) { @@ -3584,8 +3588,6 @@ int ftrace_regex_release(struct inode *inode, struct file *file) } else iter = file->private_data; - mutex_lock(&iter->ops->regex_lock); - parser = &iter->parser; if (trace_parser_loaded(parser)) { parser->buffer[parser->idx] = 0; @@ -3594,6 +3596,8 @@ int ftrace_regex_release(struct inode *inode, struct file *file) trace_parser_put(parser); + mutex_lock(&iter->ops->regex_lock); + if (file->f_mode & FMODE_WRITE) { filter_hash = !!(iter->flags & FTRACE_ITER_FILTER); @@ -3611,10 +3615,11 @@ int ftrace_regex_release(struct inode *inode, struct file *file) mutex_unlock(&ftrace_lock); } + + mutex_unlock(&iter->ops->regex_lock); free_ftrace_hash(iter->hash); kfree(iter); - mutex_unlock(&iter->ops->regex_lock); return 0; } |