From: Zakharov Vlad Date: Wed, 29 Mar 2017 10:41:46 +0000 (+0300) Subject: ezchip: nps_enet: check if napi has been completed X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=358e78b5f445c35f5b7f9241425fb499ee9fe3e2;p=openwrt%2Fstaging%2Fblogic.git ezchip: nps_enet: check if napi has been completed After a new NAPI_STATE_MISSED state was added to NAPI we can get into this state and in such case we have to reschedule NAPI as some work is still pending and we have to process it. napi_complete_done() function returns false if we have to reschedule something (e.g. in case we were in MISSED state) as current polling have not been completed yet. nps_enet driver hasn't been verifying the return value of napi_complete_done() and has been forcibly enabling interrupts. That is not correct as we should not enable interrupts before we have processed all scheduled work. As a result we were getting trapped in interrupt hanlder chain as we had never been able to disabale ethernet interrupts again. So this patch makes nps_enet_poll() func verify return value of napi_complete_done() and enable interrupts only in case all scheduled work has been completed. Signed-off-by: Vlad Zakharov Signed-off-by: David S. Miller --- diff --git a/drivers/net/ethernet/ezchip/nps_enet.c b/drivers/net/ethernet/ezchip/nps_enet.c index 992ebe973d25..f819843e2bae 100644 --- a/drivers/net/ethernet/ezchip/nps_enet.c +++ b/drivers/net/ethernet/ezchip/nps_enet.c @@ -189,11 +189,9 @@ static int nps_enet_poll(struct napi_struct *napi, int budget) nps_enet_tx_handler(ndev); work_done = nps_enet_rx_handler(ndev); - if (work_done < budget) { + if ((work_done < budget) && napi_complete_done(napi, work_done)) { u32 buf_int_enable_value = 0; - napi_complete_done(napi, work_done); - /* set tx_done and rx_rdy bits */ buf_int_enable_value |= NPS_ENET_ENABLE << RX_RDY_SHIFT; buf_int_enable_value |= NPS_ENET_ENABLE << TX_DONE_SHIFT;