net: calxedaxgmac: fix race with tx queue stop/wake

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Since the xgmac transmit start and completion work locklessly, it is
possible for xgmac_xmit to stop the tx queue after the xgmac_tx_complete
has run resulting in the tx queue never being woken up. Fix this by
ensuring that ring buffer index updates are visible and recheck the ring
space after stopping the queue. Also fix an off-by-one bug where we need
to stop the queue when the ring buffer space is equal to MAX_SKB_FRAGS.

The implementation used here was copied from
drivers/net/ethernet/broadcom/tg3.c.

Signed-off-by: Rob Herring <rob.herring@calxeda.com>
Reviewed-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Rob Herring 2013-08-30 16:49:24 -05:00 • committed by David S. Miller

parent ca32723afe

commit cbe157b60c

1 changed files with 15 additions and 5 deletions

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drivers/net/ethernet/calxeda/xgmac.c

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