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ftrace: return an error when setting a nonexistent tracer 

When one try to set a nonexistent tracer, no error is returned
as if the name of the tracer was correct.
We should return -EINVAL.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Acked-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Frederic Weisbecker 2008-10-04 22:04:44 +02:00 committed by Ingo Molnar
parent 3ea2e6d71a
commit c2931e05ec
1 changed files with 10 additions and 3 deletions
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11
kernel/trace/trace.c
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@ -2381,9 +2381,11 @@ tracing_set_trace_write(struct file *filp, const char __user *ubuf,
struct tracer *t;
char buf[max_tracer_type_len+1];
int i;
size_t ret;
if (cnt > max_tracer_type_len)
cnt = max_tracer_type_len;
ret = cnt;
if (copy_from_user(&buf, ubuf, cnt))
return -EFAULT;
@ -2399,7 +2401,11 @@ tracing_set_trace_write(struct file *filp, const char __user *ubuf,
if (strcmp(t->name, buf) == 0)
break;
}
if (!t || t == current_trace)
if (!t) {
ret = -EINVAL;
goto out;
}
if (t == current_trace)
goto out;
if (current_trace && current_trace->reset)
@ -2412,9 +2418,10 @@ tracing_set_trace_write(struct file *filp, const char __user *ubuf,
out:
mutex_unlock(&trace_types_lock);
if (ret == cnt)
filp->f_pos += cnt;
return cnt;
return ret;
}
static ssize_t