bnxt_en: Fix xmit_more with BQL.
We need to write the doorbell if BQL has stopped the queue and skb->xmit_more is set. Otherwise it is possible for the tx queue to rot and cause tx timeout. Fixes: 4d172f21 ("bnxt_en: Implement xmit_more.") Suggested-by: Yuval Mintz <yuval.mintz@cavium.com> Signed-off-by: Michael Chan <michael.chan@broadcom.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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