From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Kweh, Hock Leong" Subject: [PATCH v3] net: stmmac: fix maxmtu assignment to be within valid range Date: Sat, 7 Jan 2017 08:49:03 +0800 Message-ID: <1483750143-11966-1-git-send-email-hock.leong.kweh@intel.com> Cc: Alexandre TORGUE , Joachim Eastwood , Niklas Cassel , Johan Hovold , pavel@ucw.cz, "Kweh, Hock Leong" , lars.persson@axis.com, netdev , LKML To: "David S. Miller" , Joao Pinto , Giuseppe CAVALLARO , seraphin.bonnaffe@st.com, Jarod Wilson , Andy Shevchenko Return-path: Received: from mga11.intel.com ([192.55.52.93]:18786 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753574AbdAFQoJ (ORCPT ); Fri, 6 Jan 2017 11:44:09 -0500 Sender: netdev-owner@vger.kernel.org List-ID: From: "Kweh, Hock Leong" There is no checking valid value of maxmtu when getting it from device tree. This resolution added the checking condition to ensure the assignment is made within a valid range. Signed-off-by: Kweh, Hock Leong --- changelog v3: * print the warning message only if maxmtu < min_mtu * add maxmtu = JUMBO_LEN at stmmac_pci.c to follow stmmac_platform.c changelog v2: * correction of "devicetree" to "device tree" reported by Andy * print warning message while maxmtu is not in valid range drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 8 +++++++- drivers/net/ethernet/stmicro/stmmac/stmmac_pci.c | 4 ++++ 2 files changed, 11 insertions(+), 1 deletion(-) diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c index 92ac006..ce74ae6 100644 --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c @@ -3345,8 +3345,14 @@ int stmmac_dvr_probe(struct device *device, ndev->max_mtu = JUMBO_LEN; else ndev->max_mtu = SKB_MAX_HEAD(NET_SKB_PAD + NET_IP_ALIGN); - if (priv->plat->maxmtu < ndev->max_mtu) + + if ((priv->plat->maxmtu < ndev->max_mtu) && + (priv->plat->maxmtu >= ndev->min_mtu)) ndev->max_mtu = priv->plat->maxmtu; + else if (priv->plat->maxmtu < ndev->min_mtu) + netdev_warn(priv->dev, + "%s: warning: maxmtu having invalid value (%d)\n", + __func__, priv->plat->maxmtu); if (flow_ctrl) priv->flow_ctrl = FLOW_AUTO; /* RX/TX pause on */ diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_pci.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_pci.c index a283177..e539afe 100644 --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_pci.c +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_pci.c @@ -204,6 +204,10 @@ static int stmmac_pci_probe(struct pci_dev *pdev, pci_set_master(pdev); + /* Set the maxmtu to a default of JUMBO_LEN in case the + * parameter is not defined for the device. + */ + plat->maxmtu = JUMBO_LEN; if (info) { info->pdev = pdev; if (info->setup) { -- 1.7.9.5