ring: purge timer before we unmap tx ring buffers

If we unmap TX ring buffers and still have timer shots that trigger
the kernel to traverse the TX_RING, it can send out random crap in
some situations. Prevent this by destroying the timer and flush the
TX_RING first in wait mode.

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/ring_tx.c b/ring_tx.c
index 6804c43..2ad1de9 100644
--- a/ring_tx.c
+++ b/ring_tx.c
@@ -40,7 +40,7 @@ void destroy_tx_ring(int sock, struct ring *ring)
 	ret = setsockopt(sock, SOL_PACKET, PACKET_TX_RING, &ring->layout,
 			 sizeof(ring->layout));
 	if (unlikely(ret))
-		panic("Cannot destroy the TX_RING!\n");
+		panic("Cannot destroy the TX_RING: %s!\n", strerror(errno));
 
 	xfree(ring->frames);
 }