net: stmmac: Fixed mtu channged by cache aligned
[ Upstream commit5.4-rM2-2.2.x-imx-squashed5b55299eed
] Since the original mtu is not used when the mtu is updated, the mtu is aligned with cache, this will get an incorrect. For example, if you want to configure the mtu to be 1500, but mtu 1536 is configured in fact. Fixed:eaf4fac478
("net: stmmac: Do not accept invalid MTU values") Signed-off-by: David Wu <david.wu@rock-chips.com> Link: https://lore.kernel.org/r/20210113034109.27865-1-david.wu@rock-chips.com Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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c213d85cae
commit
a3870cf8a7
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@ -3739,6 +3739,7 @@ static int stmmac_change_mtu(struct net_device *dev, int new_mtu)
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{
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struct stmmac_priv *priv = netdev_priv(dev);
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int txfifosz = priv->plat->tx_fifo_size;
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const int mtu = new_mtu;
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if (txfifosz == 0)
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txfifosz = priv->dma_cap.tx_fifo_size;
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@ -3756,7 +3757,7 @@ static int stmmac_change_mtu(struct net_device *dev, int new_mtu)
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if ((txfifosz < new_mtu) || (new_mtu > BUF_SIZE_16KiB))
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return -EINVAL;
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dev->mtu = new_mtu;
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dev->mtu = mtu;
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netdev_update_features(dev);
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