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    • Brice Goglin's avatar
      myri10ge: fix stop/go ordering even more · 8c2f5fa5
      Brice Goglin authored
      
      
      The doorbell writes may be seen out of order by the firmware if they
      are in WC memory since the tx spin(un)lock does not flush WC writes.
      Hence if the "stop" is written on a different CPU than the "go", it
      is possible that the stop will arrive after the go unless we add an
      explicit memory barrier (and mmiowb() is not enough).
      
      It fixes transmit hangs in multi tx queue mode.
      Signed-off-by: default avatarBrice Goglin <brice@myri.com>
      Signed-off-by: default avatarJeff Garzik <jgarzik@redhat.com>
      8c2f5fa5
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