netdev - Re: [net PATCH 1/1] drivers: net: ethernet: ti: davinci_emac: fix usage of cpdma_check_free_tx

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Date:	Sat, 16 Mar 2013 12:43:14 +0530
From:	Prabhakar Lad <prabhakar.csengg@...il.com>
To:	Mugunthan V N <mugunthanvnm@...com>
Cc:	netdev@...r.kernel.org, davem@...emloft.net,
	linux-omap@...r.kernel.org,
	dlos <davinci-linux-open-source@...ux.davincidsp.com>
Subject: Re: [net PATCH 1/1] drivers: net: ethernet: ti: davinci_emac: fix
 usage of cpdma_check_free_tx_desc()

Hi Mugunthan

Thanks for the patch!

On Fri, Mar 15, 2013 at 7:40 PM, Mugunthan V N <mugunthanvnm@...com> wrote:
> Fix which was done in the following commit in cpsw driver has
> to be taken forward to davinci emac driver as well.
>
> commit d35162f89b8f00537d7b240b76d2d0e8b8d29aa0
> Author: Daniel Mack <zonque@...il.com>
> Date:   Tue Mar 12 06:31:19 2013 +0000
>
>     net: ethernet: cpsw: fix usage of cpdma_check_free_tx_desc()
>
>     Commit fae50823d0 ("net: ethernet: davinci_cpdma: Add boundary for rx
>     and tx descriptors") introduced a function to check the current
>     allocation state of tx packets. The return value is taken into account
>     to stop the netqork queue on the adapter in case there are no free
>     slots.
>
>     However, cpdma_check_free_tx_desc() returns 'true' if there is room in
>     the bitmap, not 'false', so the usage of the function is wrong.
>
> Reported-by: Prabhakar Lad <prabhakar.csengg@...il.com>
> Signed-off-by: Mugunthan V N <mugunthanvnm@...com>

 Tested-by: Lad, Prabhakar <prabhakar.csengg@...il.com>

Cheers,
--Prabhakar Lad
http://www.linkedin.com/pub/prabhakar-lad/19/92b/955

> ---
>  drivers/net/ethernet/ti/davinci_emac.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/net/ethernet/ti/davinci_emac.c b/drivers/net/ethernet/ti/davinci_emac.c
> index 52c0536..ae1b77a 100644
> --- a/drivers/net/ethernet/ti/davinci_emac.c
> +++ b/drivers/net/ethernet/ti/davinci_emac.c
> @@ -1102,7 +1102,7 @@ static int emac_dev_xmit(struct sk_buff *skb, struct net_device *ndev)
>         /* If there is no more tx desc left free then we need to
>          * tell the kernel to stop sending us tx frames.
>          */
> -       if (unlikely(cpdma_check_free_tx_desc(priv->txchan)))
> +       if (unlikely(!cpdma_check_free_tx_desc(priv->txchan)))
>                 netif_stop_queue(ndev);
>
>         return NETDEV_TX_OK;
> --
> 1.7.9.5
>
> --
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