r8169: remove unneeded memory barrier in rtl_tx
tp->dirty_tx isn't changed outside rtl_tx(). Therefore I see no need to guarantee a specific order of reading tp->dirty_tx and tp->cur_tx. Having said that we can remove the memory barrier. In addition use READ_ONCE() when reading tp->cur_tx because it can change in parallel to rtl_tx(). Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> Link: https://lore.kernel.org/r/2264563a-fa9e-11b0-2c42-31bc6b8e2790@gmail.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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@ -4364,9 +4364,8 @@ static void rtl_tx(struct net_device *dev, struct rtl8169_private *tp,
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unsigned int dirty_tx, tx_left, bytes_compl = 0, pkts_compl = 0;
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dirty_tx = tp->dirty_tx;
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smp_rmb();
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for (tx_left = tp->cur_tx - dirty_tx; tx_left > 0; tx_left--) {
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for (tx_left = READ_ONCE(tp->cur_tx) - dirty_tx; tx_left; tx_left--) {
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unsigned int entry = dirty_tx % NUM_TX_DESC;
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struct sk_buff *skb = tp->tx_skb[entry].skb;
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u32 status;
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