From: Steven Rostedt <srostedt@redhat.com>
Date: Tue, 3 Mar 2009 01:56:48 +0000 (-0500)
Subject: ring-buffer: reset write field for ring_buffer_read_page
X-Git-Tag: v2.6.30-rc1~2^2~70^2~2^2~4
X-Git-Url: https://openfabrics.org/gitweb/?a=commitdiff_plain;h=41be4da4e85e58520b934040966a6ae919c66c2d;p=~shefty%2Frdma-dev.git

ring-buffer: reset write field for ring_buffer_read_page

Impact: fix ring_buffer_read_page

After a page is swapped into the ring buffer, the write field must
also be reset.

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

diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index a8c275c01e8..9baad7ee4b3 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -2492,6 +2492,7 @@ int ring_buffer_read_page(struct ring_buffer *buffer,
 		rb_init_page(bpage);
 		bpage = cpu_buffer->reader_page->page;
 		cpu_buffer->reader_page->page = *data_page;
+		local_set(&cpu_buffer->reader_page->write, 0);
 		cpu_buffer->reader_page->read = 0;
 		*data_page = bpage;
 	}