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SubjectRe: [PATCH RT 2/4] net: gianfar: do not try to cleanup TX packets if they are not done
On 14-04-28 02:37 AM, Sebastian Andrzej Siewior wrote:
> On 04/27/2014 04:31 PM, Steven Rostedt wrote:
>> diff --git a/drivers/net/ethernet/freescale/gianfar.c b/drivers/net/ethernet/freescale/gianfar.c
>> index 5c0efcc..8aecc1d 100644
>> --- a/drivers/net/ethernet/freescale/gianfar.c
>> +++ b/drivers/net/ethernet/freescale/gianfar.c
>> @@ -2856,10 +2855,14 @@ static int gfar_poll(struct napi_struct *napi, int budget)
>> tx_queue = priv->tx_queue[i];
>> /* run Tx cleanup to completion */
>> if (tx_queue->tx_skbuff[tx_queue->skb_dirtytx]) {
>> - gfar_clean_tx_ring(tx_queue);
>> - has_tx_work = 1;
>> + int ret;
>> +
>> + ret = gfar_clean_tx_ring(tx_queue);
>> + if (ret)
>> + has_tx_work++;
>> }
>> }
>> + work_done += has_tx_work;
>>
>> for_each_set_bit(i, &gfargrp->rx_bit_map, priv->num_rx_queues) {
>> /* skip queue if not active */
>
> The 3.14-RT version of the patch should have an additional return
> statement here which I forgot initially.

Sanity boot tested the 3.10 rc1 on a sbc8548 (UP PPC with gianfar), with
the one-liner added as follows:

diff --git a/drivers/net/ethernet/freescale/gianfar.c b/drivers/net/ethernet/freescale/gianfar.c
index 8aecc1d81395..b87a8c919c3e 100644
--- a/drivers/net/ethernet/freescale/gianfar.c
+++ b/drivers/net/ethernet/freescale/gianfar.c
@@ -2574,6 +2574,7 @@ static int gfar_clean_tx_ring(struct gfar_priv_tx_q *tx_queue)
tx_queue->dirty_tx = bdp;

netdev_tx_completed_queue(txq, howmany, bytes_sent);
+ return howmany;
}

static void gfar_schedule_cleanup(struct gfar_priv_grp *gfargrp)
Paul.
--


>
> Sebastian
>


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