netdev - Re: [PATCH net-next 4/4] gianfar: use netif_tx_queue_stopped instead of __netif_subqueue

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Message-ID: <CAP=VYLpzpbLVAJ6=L1jdoZWcyAWPPKGMFTKBVU=7=HR+qTxwwA@mail.gmail.com>
Date:	Sun, 18 Mar 2012 19:24:44 -0400
From:	Paul Gortmaker <paul.gortmaker@...driver.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	davem@...emloft.net, therbert@...gle.com, netdev@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH net-next 4/4] gianfar: use netif_tx_queue_stopped instead
 of __netif_subqueue_stopped

On Sun, Mar 18, 2012 at 5:55 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> On Sun, 2012-03-18 at 17:39 -0400, Paul Gortmaker wrote:
>> The __netif_subqueue_stopped() just does the following:
>>
>>         struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
>>         return netif_tx_queue_stopped(txq);
>>
>> and since we already have the txq in scope, we can just call that
>> directly in this case.
>>
>> Suggested-by: Eric Dumazet <eric.dumazet@...il.com>
>> Signed-off-by: Paul Gortmaker <paul.gortmaker@...driver.com>
>> ---
>>  drivers/net/ethernet/freescale/gianfar.c |    2 +-
>>  1 files changed, 1 insertions(+), 1 deletions(-)
>>
>> diff --git a/drivers/net/ethernet/freescale/gianfar.c b/drivers/net/ethernet/freescale/gianfar.c
>> index 6e66cc3..d9428f0 100644
>> --- a/drivers/net/ethernet/freescale/gianfar.c
>> +++ b/drivers/net/ethernet/freescale/gianfar.c
>> @@ -2565,7 +2565,7 @@ static int gfar_clean_tx_ring(struct gfar_priv_tx_q *tx_queue)
>>       }
>>
>>       /* If we freed a buffer, we can restart transmission, if necessary */
>> -     if (__netif_subqueue_stopped(dev, tqi) && tx_queue->num_txbdfree)
>> +     if (netif_tx_queue_stopped(txq) && tx_queue->num_txbdfree)
>>               netif_wake_subqueue(dev, tqi);
>>
>>       /* Update dirty indicators */
>
> Please change netif_wake_subqueue() as well ;)

I looked at this earlier when I added patch #4 but I was concerned about
the different semantics.

The netif_wake_subqueue() just returns on a netpoll_trap but the other
netif_tx_wake_queue() actually calls netif_tx_start_queue() for the same
netpoll_trap instance.  Maybe that is OK, but I didn't want to be changing
the behaviour of subtleties in stuff where I am clearly still learning.

Thanks,
Paul.

>
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