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    IPoIB: Use netif_tx_lock() and get rid of private tx_lock, LLTX · 943c246e
    Roland Dreier 提交于
    Currently, IPoIB is an LLTX driver that uses its own IRQ-disabling
    tx_lock.  Not only do we want to get rid of LLTX, this actually causes
    problems because of the skb_orphan() done with this tx_lock held: some
    skb destructors expect to be run with interrupts enabled.
    
    The simplest fix for this is to get rid of the driver-private tx_lock
    and stop using LLTX.  We kill off priv->tx_lock and use
    netif_tx_lock[_bh]() instead; the patch to do this is a tiny bit
    tricky because we need to update places that take priv->lock inside
    the tx_lock to disable IRQs, rather than relying on tx_lock having
    already disabled IRQs.
    
    Also, there are a couple of places where we need to disable BHs to
    make sure we have a consistent context to call netif_tx_lock() (since
    we no longer can use _irqsave() variants), and we also have to change
    ipoib_send_comp_handler() to call drain_tx_cq() through a timer rather
    than directly, because ipoib_send_comp_handler() runs in interrupt
    context and drain_tx_cq() must run in BH context so it can call
    netif_tx_lock().
    Signed-off-by: NRoland Dreier <rolandd@cisco.com>
    943c246e
ipoib.h 20.2 KB