Author: zbb
Date: Tue Jul 4 00:00:42 2017
New Revision: 320626
URL: https://svnweb.freebsd.org/changeset/base/320626
Log:
Acquire locks before calling drbr_flush()
It is required to hold lock that is associated with buffer ring before
flushing drbr.
Submitted by: Michal Krawczyk <m...@semihalf.com>
Obtained from: Semihalf
Sponsored by: Amazon.com Inc.
Modified:
head/sys/dev/ena/ena.c
Modified: head/sys/dev/ena/ena.c
==============================================================================
--- head/sys/dev/ena/ena.c Mon Jul 3 23:59:11 2017 (r320625)
+++ head/sys/dev/ena/ena.c Tue Jul 4 00:00:42 2017 (r320626)
@@ -642,7 +642,9 @@ ena_setup_tx_resources(struct ena_adapter *adapter, in
tx_ring->next_to_clean = 0;
/* Make sure that drbr is empty */
+ ENA_RING_MTX_LOCK(tx_ring);
drbr_flush(adapter->ifp, tx_ring->br);
+ ENA_RING_MTX_UNLOCK(tx_ring);
/* ... and create the buffer DMA maps */
for (i = 0; i < tx_ring->ring_size; i++) {
@@ -709,11 +711,11 @@ ena_free_tx_resources(struct ena_adapter *adapter, int
taskqueue_free(tx_ring->enqueue_tq);
+ ENA_RING_MTX_LOCK(tx_ring);
/* Flush buffer ring, */
drbr_flush(adapter->ifp, tx_ring->br);
/* Free buffer DMA maps, */
- ENA_RING_MTX_LOCK(tx_ring);
for (int i = 0; i < tx_ring->ring_size; i++) {
m_freem(tx_ring->tx_buffer_info[i].mbuf);
tx_ring->tx_buffer_info[i].mbuf = NULL;
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