diff options
| -rw-r--r-- | kernel/trace/trace.c | 20 |
1 files changed, 14 insertions, 6 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index 485c6e7f446..6c89ec6cbd4 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -2024,12 +2024,12 @@ static ssize_t tracing_trace_options_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) { - int i; + struct tracer_opt *trace_opts; + u32 tracer_flags; + int len = 0; char *buf; int r = 0; - int len = 0; - u32 tracer_flags = current_trace->flags->val; - struct tracer_opt *trace_opts = current_trace->flags->opts; + int i; /* calculate max size */ @@ -2038,6 +2038,10 @@ tracing_trace_options_read(struct file *filp, char __user *ubuf, len += 3; /* "no" and space */ } + mutex_lock(&trace_types_lock); + tracer_flags = current_trace->flags->val; + trace_opts = current_trace->flags->opts; + /* * Increase the size with names of options specific * of the current tracer. @@ -2049,8 +2053,10 @@ tracing_trace_options_read(struct file *filp, char __user *ubuf, /* +2 for \n and \0 */ buf = kmalloc(len + 2, GFP_KERNEL); - if (!buf) + if (!buf) { + mutex_unlock(&trace_types_lock); return -ENOMEM; + } for (i = 0; trace_options[i]; i++) { if (trace_flags & (1 << i)) @@ -2067,6 +2073,7 @@ tracing_trace_options_read(struct file *filp, char __user *ubuf, r += sprintf(buf + r, "no%s ", trace_opts[i].name); } + mutex_unlock(&trace_types_lock); r += sprintf(buf + r, "\n"); WARN_ON(r >= len + 2); @@ -2074,7 +2081,6 @@ tracing_trace_options_read(struct file *filp, char __user *ubuf, r = simple_read_from_buffer(ubuf, cnt, ppos, buf, r); kfree(buf); - return r; } @@ -2149,7 +2155,9 @@ tracing_trace_options_write(struct file *filp, const char __user *ubuf, /* If no option could be set, test the specific tracer options */ if (!trace_options[i]) { + mutex_lock(&trace_types_lock); ret = set_tracer_option(current_trace, cmp, neg); + mutex_unlock(&trace_types_lock); if (ret) return ret; } |