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ring-buffer: check for failed allocation in ring buffer benchmark

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The result of the allocation of the ring buffer read page in the
ring buffer bench mark does not check the return to see if a page
was actually allocated. This patch fixes that.

[ Impact: avoid NULL dereference ]

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt 2009-05-06 12:40:51 -04:00 committed by Steven Rostedt
parent 8e7abf1c62
commit 00c81a58c5
1 changed files with 3 additions and 0 deletions
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3
kernel/trace/ring_buffer_benchmark.c
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@ -84,6 +84,9 @@ static enum event_status read_page(int cpu)
int i;
bpage = ring_buffer_alloc_read_page(buffer);
if (!bpage)
return EVENT_DROPPED;
ret = ring_buffer_read_page(buffer, &bpage, PAGE_SIZE, cpu, 1);
if (ret >= 0) {
rpage = bpage;