ring-buffer: check for less than two in size allocation

The ring buffer must have at least two pages allocated for the
reader page swap to work.

The page count check will miss the case of a zero size passed in.
Even though a zero size ring buffer would probably fail an allocation,
making the min size check for less than two instead of equal to one makes
the code a bit more robust.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt 2009-06-17 14:11:10 -04:00 committed by Steven Rostedt
parent 0dcd4d6c3e
commit 5f78abeebb

View File

@ -657,8 +657,8 @@ struct ring_buffer *__ring_buffer_alloc(unsigned long size, unsigned flags,
buffer->reader_lock_key = key;
/* need at least two pages */
if (buffer->pages == 1)
buffer->pages++;
if (buffer->pages < 2)
buffer->pages = 2;
/*
* In case of non-hotplug cpu, if the ring-buffer is allocated