From: Harini Katakam harini.katakam@xilinx.com
[ Upstream commit 0504453139ef5a593c9587e1e851febee859c7d8 ]
Current order in open: -> Enable interrupts (macb_init_hw) -> Enable NAPI -> Start PHY
Sequence of RX handling: -> RX interrupt occurs -> Interrupt is cleared and interrupt bits disabled in handler -> NAPI is scheduled -> In NAPI, RX budget is processed and RX interrupts are re-enabled
With the above, on QEMU or fixed link setups (where PHY state doesn't matter), there's a chance macb RX interrupt occurs before NAPI is enabled. This will result in NAPI being scheduled before it is enabled. Fix this macb open by changing the order.
Fixes: ae1f2a56d273 ("net: macb: Added support for many RX queues") Signed-off-by: Harini Katakam harini.katakam@xilinx.com Acked-by: Nicolas Ferre nicolas.ferre@microchip.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/ethernet/cadence/macb_main.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
--- a/drivers/net/ethernet/cadence/macb_main.c +++ b/drivers/net/ethernet/cadence/macb_main.c @@ -2461,12 +2461,12 @@ static int macb_open(struct net_device * goto pm_exit; }
- bp->macbgem_ops.mog_init_rings(bp); - macb_init_hw(bp); - for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) napi_enable(&queue->napi);
+ bp->macbgem_ops.mog_init_rings(bp); + macb_init_hw(bp); + /* schedule a link state check */ phy_start(dev->phydev);