tracing: fix seq read from trace files

The buffer used by trace_seq was updated incorrectly. Instead
of consuming what was actually read, it consumed the rest of the
buffer on reads.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 57155dc53530d2114f79b85e290bbbc685b661a4..2e53e6f094403801b37fb543ec9055c03b77f339 100644 (file)
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -361,7 +361,7 @@ ssize_t trace_seq_to_user(struct trace_seq *s, char __user *ubuf, size_t cnt)
 
        cnt -= ret;
 
-       s->readpos += len;
+       s->readpos += cnt;
        return cnt;
 }
 
@@ -380,7 +380,7 @@ ssize_t trace_seq_to_buffer(struct trace_seq *s, void *buf, size_t cnt)
        if (!ret)
                return -EFAULT;
 
-       s->readpos += len;
+       s->readpos += cnt;
        return cnt;
 }