netdev - Re: [PATCH v2 04/46] net/wireless: p54: remove useless dma_sync_single_for_device(DMA_FROM

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Date:	Tue, 12 Jul 2011 12:50:20 +0800
From:	Felix Fietkau <nbd@...nwrt.org>
To:	Michał Mirosław <mirq-linux@...e.qmqm.pl>
CC:	netdev@...r.kernel.org,
	Christian Lamparter <chunkeey@...glemail.com>,
	"John W. Linville" <linville@...driver.com>,
	linux-wireless@...r.kernel.org
Subject: Re: [PATCH v2 04/46] net/wireless: p54: remove useless dma_sync_single_for_device(DMA_FROM_DEVICE)

On 2011-07-11 8:52 AM, Michał Mirosław wrote:
> Also constify pointers used in frame parsers to verify assumptions.
>
> Signed-off-by: Michał Mirosław<mirq-linux@...e.qmqm.pl>
> ---
>   drivers/net/wireless/p54/p54pci.c |    2 --
>   drivers/net/wireless/p54/txrx.c   |   22 +++++++++++-----------
>   2 files changed, 11 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/net/wireless/p54/p54pci.c b/drivers/net/wireless/p54/p54pci.c
> index 1b75317..4491d33 100644
> --- a/drivers/net/wireless/p54/p54pci.c
> +++ b/drivers/net/wireless/p54/p54pci.c
> @@ -229,8 +229,6 @@ static void p54p_check_rx_ring(struct ieee80211_hw *dev, u32 *index,
>   			desc->host_addr = cpu_to_le32(0);
>   		} else {
>   			skb_trim(skb, 0);
> -			pci_dma_sync_single_for_device(priv->pdev, dma_addr,
> -				priv->common.rx_mtu + 32, PCI_DMA_FROMDEVICE);
>   			desc->len = cpu_to_le16(priv->common.rx_mtu + 32);
>   		}
>
This part does not look correct to me - same issue as your ath9k change, 
which I commented on earlier. I don't think this call to 
dma_sync_single_for_device is useless

- Felix

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