> netif_queue_stopped is an atomic, I think that would be sufficient, no?
netif_queue_stopped does test_bit(), which is an implicit memory
barrier. But I think it's pretty subtle -- you have to look at every
place tx_head and tx_tail are updated and decide if there needs to be
a corresponding barrier.
For example, in:
+ if (netif_queue_stopped(dev) &&
+ priv->tx_head - priv->tx_tail < ipoib_sendq_size) {
there is a barrier in netif_queue_stopped() but no control in what
order tx_head and tx_tail are read...
- R.
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