netdev - Re: [PATCH 2/2 v2] KS8695: fix ks8695

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Date:	Fri, 13 Nov 2009 01:16:34 +0800
From:	"Figo.zhang" <figo1802@...il.com>
To:	zeal <zealcook@...il.com>
Cc:	netdev@...r.kernel.org, ben@...tec.co.uk, davem@...emloft.net
Subject: Re: [PATCH 2/2 v2] KS8695: fix ks8695_rx() unreasonable action.

On Mon, 2009-11-16 at 22:58 +0800, zeal wrote:
> From: zeal <zealcook@...il.com>
> 
> ks8695_rx() will call refill_buffers() for every incoming packet.
> Its not necessary. We just need do it after finishing receiving thing.
> And the 'RX dma engine' is in the same situation.
> This blocks our user space application. The following patch may fix it.
> 

yes, it is right.

Best,
Figo.zhang

> Signed-off-by: zeal <zealcook@...il.com>
> ---
>  drivers/net/arm/ks8695net.c |   13 ++++++-------
>  1 files changed, 6 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/net/arm/ks8695net.c b/drivers/net/arm/ks8695net.c
> index e15451a..be256b3 100644
> --- a/drivers/net/arm/ks8695net.c
> +++ b/drivers/net/arm/ks8695net.c
> @@ -544,14 +544,13 @@ rx_finished:
>  				ksp->next_rx_desc_read =
>  					(last_rx_processed + 1) &
>  					MAX_RX_DESC_MASK;
> -
> -			/* And refill the buffers */
> -			ks8695_refill_rxbuffers(ksp);
> -
> -			/* Kick the RX DMA engine, in case it became
> -			 *  suspended */
> -			ks8695_writereg(ksp, KS8695_DRSC, 0);
>  	}
> +	/* And refill the buffers */
> +	ks8695_refill_rxbuffers(ksp);
> +
> +	/* Kick the RX DMA engine, in case it became
> +	 *  suspended */
> +	ks8695_writereg(ksp, KS8695_DRSC, 0);
>  	return received;
>  }
>  


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