bnxt: don't lock the tx queue from napi poll
We can't take the tx lock from the napi poll routine, because netpoll can poll napi at any moment, including with the tx lock already held. The tx lock is protecting against two paths - the disable path, and (as Michael points out) the NETDEV_TX_BUSY case which may occur if NAPI completions race with start_xmit and both decide to re-enable the queue. For the disable/ifdown path use synchronize_net() to make sure closing the device does not race we restarting the queues. Annotate accesses to dev_state against data races. For the NAPI cleanup vs start_xmit path - appropriate barriers are already in place in the main spot where Tx queue is stopped but we need to do the same careful dance in the TX_BUSY case. Fixes: c0c050c5 ("bnxt_en: New Broadcom ethernet driver.") Reviewed-by:Michael Chan <michael.chan@broadcom.com> Reviewed-by:
Edwin Peer <edwin.peer@broadcom.com> Signed-off-by:
Jakub Kicinski <kuba@kernel.org>
parent
f8e6dfc6