mwl8k: minor transmit quiescing rework
Minor changes to the transmit quiescing logic: - Clarify the locking rules for ->tx_wait: only the holder of fw_mutex can wait for the TX path to become idle, but tx_wait itself is read and cleared by the TX reclaim tasklet under tx_lock. - Inline mwl8k_txq_busy() in its callers. - There's no need to kick the transmitter again in mwl8k_tx_wait_empty(), since it will have been kicked when the packets currently in the TX ring were added to it. - If the TX ring didn't drain in time, run mwl8k_scan_tx_ring() after reading priv->pending_pkts without dropping tx_lock in between. Signed-off-by: NLennert Buytenhek <buytenh@marvell.com> Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>
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