[Xen-changelog] Fixed consoled race condition.

[Xen patchbot -unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User cl349@xxxxxxxxxxxxxxxxxxxx
# Node ID 4d018790ff8a17e6fcfce4e274fd4b9fac0ab568
# Parent  0fad07d67e758290d5921a82f6099fa6c186099f
Fixed consoled race condition.
Signed-off by: Andy Peace <andrew.peace@xxxxxxxxxxxxx>
Signed-off-by: Christian Limpach <Christian.Limpach@xxxxxxxxxxxx>

diff -r 0fad07d67e75 -r 4d018790ff8a tools/console/daemon/io.c
--- a/tools/console/daemon/io.c Tue Sep 13 10:05:49 2005
+++ b/tools/console/daemon/io.c Tue Sep 13 10:13:52 2005
@@ -87,6 +87,7 @@
        struct buffer *buffer = &dom->buffer;
        struct ring_head *ring = (struct ring_head *)dom->page;
        size_t size;
+       u32 oldcons;
 
        while ((size = ring->prod - ring->cons) != 0) {
                if ((buffer->capacity - buffer->size) < size) {
@@ -98,7 +99,8 @@
                        }
                }
 
-               while (ring->cons < ring->prod) {
+               oldcons = ring->cons;
+               while (ring->cons < (oldcons + size)) {
                        buffer->data[buffer->size] =
                                ring->buf[XENCONS_IDX(ring->cons)];
                        buffer->size++;

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