netdev - [PATCH net-next 1/3] nfp: free buffers before changing MTU

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Message-Id: <1451923395-24533-2-git-send-email-jakub.kicinski@netronome.com>
Date:	Mon,  4 Jan 2016 16:03:13 +0000
From:	Jakub Kicinski <jakub.kicinski@...ronome.com>
To:	netdev@...r.kernel.org
Cc:	simon.horman@...ronome.com, rolf.neugebauer@...ronome.com,
	Jakub Kicinski <jakub.kicinski@...ronome.com>
Subject: [PATCH net-next 1/3] nfp: free buffers before changing MTU

For freeing DMA buffers we depend on nfp_net.fl_bufsz having the same
value as during allocation therefore in .ndo_change_mtu we must first
free the buffers and then change the setting.

Signed-off-by: Jakub Kicinski <jakub.kicinski@...ronome.com>
Reviewed-by: Rolf Neugebauer <rolf.neugebauer@...ronome.com>
---
 drivers/net/ethernet/netronome/nfp/nfp_net_common.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
index 43c618bafdb6..2826166547fd 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
@@ -1920,17 +1920,17 @@ static int nfp_net_change_mtu(struct net_device *netdev, int new_mtu)
 		return -EINVAL;
 	}
 
+	if (netif_running(netdev))
+		nfp_net_netdev_close(netdev);
+
 	netdev->mtu = new_mtu;
 
 	/* Freelist buffer size rounded up to the nearest 1K */
 	tmp = new_mtu + ETH_HLEN + VLAN_HLEN + NFP_NET_MAX_PREPEND;
 	nn->fl_bufsz = roundup(tmp, 1024);
 
-	/* restart if running */
-	if (netif_running(netdev)) {
-		nfp_net_netdev_close(netdev);
+	if (netif_running(netdev))
 		nfp_net_netdev_open(netdev);
-	}
 
 	return 0;
 }
-- 
1.9.1

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