netdev - [PATCH net-next 4/7] ibmvnic: Unmap longer term buffer before free

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Message-Id: <20170409041150.47642.41260.stgit@ltcalpine2-lp14.aus.stglabs.ibm.com>
Date:   Sun, 09 Apr 2017 00:11:50 -0400
From:   Nathan Fontenot <nfont@...ux.vnet.ibm.com>
To:     netdev@...r.kernel.org, tlfalcon@...ux.vnet.ibm.com,
        jallen@...ux.vnet.ibm.com
Cc:     brking@...ux.vnet.ibm.com, muvic@...ux.vnet.ibm.com
Subject: [PATCH net-next 4/7] ibmvnic: Unmap longer term buffer before free

From: Brian King <brking@...ux.vnet.ibm.com>

Make sure we unregister long term buffers from the adapter
prior to DMA unmapping it and freeing the buffer. Failure
to do so could result in a DMA to a now invalid address.

Signed-off-by: Brian King <brking@...ux.vnet.ibm.com>
Signed-off-by: Nathan Fontenot <nfont@...ux.vnet.ibm.com>
---
 drivers/net/ethernet/ibm/ibmvnic.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c
index 2e4d787..5f9aad8 100644
--- a/drivers/net/ethernet/ibm/ibmvnic.c
+++ b/drivers/net/ethernet/ibm/ibmvnic.c
@@ -193,9 +193,9 @@ static void free_long_term_buff(struct ibmvnic_adapter *adapter,
 	if (!ltb->buff)
 		return;
 
-	dma_free_coherent(dev, ltb->size, ltb->buff, ltb->addr);
 	if (!adapter->failover)
 		send_request_unmap(adapter, ltb->map_id);
+	dma_free_coherent(dev, ltb->size, ltb->buff, ltb->addr);
 }
 
 static void replenish_rx_pool(struct ibmvnic_adapter *adapter,