On Friday 01 August 2008, Carl Love wrote:

If an error occurs on opcontrol start, the event and per cpu buffers=20
are released. =A0If later opcontrol shutdown is called then the free
function will be called again to free buffers that no longer=20
exist. =A0This results in a kernel oops. =A0The following changes
prevent the call to delete buffers that don't exist.
=20
Signed-off-by: Carl Love <redacted>
=20

vfree(NULL) is defined to be legal, so you don't need to check the
argument for being non-NULL, just set it to NULL after the free.

	Arnd <><