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-rw-r--r--kernel/trace/trace.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index bc577dcc0e4..a610ca77155 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -2377,9 +2377,10 @@ tracing_set_trace_write(struct file *filp, const char __user *ubuf,
int i;
size_t ret;
+ ret = cnt;
+
if (cnt > max_tracer_type_len)
cnt = max_tracer_type_len;
- ret = cnt;
if (copy_from_user(&buf, ubuf, cnt))
return -EFAULT;
@@ -2412,8 +2413,8 @@ tracing_set_trace_write(struct file *filp, const char __user *ubuf,
out:
mutex_unlock(&trace_types_lock);
- if (ret == cnt)
- filp->f_pos += cnt;
+ if (ret > 0)
+ filp->f_pos += ret;
return ret;
}