Merge branch 'fix/hda' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6

[linux-2.6-omap-h63xx.git] / kernel / trace / trace_selftest.c

diff --git a/kernel/trace/trace_selftest.c b/kernel/trace/trace_selftest.c
index a7e0ef662f9f9bd593949b6d66f1e3872baf04b3..bc8e80a86bca4c0cf730fcf6b7bc568f2808f7e7 100644 (file)
--- a/kernel/trace/trace_selftest.c
+++ b/kernel/trace/trace_selftest.c
@@ -23,10 +23,20 @@ static int trace_test_buffer_cpu(struct trace_array *tr, int cpu)
 {
        struct ring_buffer_event *event;
        struct trace_entry *entry;
+       unsigned int loops = 0;
 
        while ((event = ring_buffer_consume(tr->buffer, cpu, NULL))) {
                entry = ring_buffer_event_data(event);
 
+               /*
+                * The ring buffer is a size of trace_buf_size, if
+                * we loop more than the size, there's something wrong
+                * with the ring buffer.
+                */
+               if (loops++ > trace_buf_size) {
+                       printk(KERN_CONT ".. bad ring buffer ");
+                       goto failed;
+               }
                if (!trace_valid_entry(entry)) {
                        printk(KERN_CONT ".. invalid entry %d ",
                                entry->type);