netdev - Re: [PATCH V3.8 5/5] rtlwifi: rtl8723ae: Fix warning for unchecked pci_map

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Date:	Wed, 26 Dec 2012 15:13:51 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Larry Finger <Larry.Finger@...inger.net>
Cc:	linville@...driver.com, linux-wireless@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH V3.8 5/5] rtlwifi: rtl8723ae: Fix warning for unchecked
 pci_map_single() call

On Wed, 2012-12-26 at 16:08 -0600, Larry Finger wrote:
> Kernel 3.8 implements checking of all DMA mapping calls and issues
> a WARNING for the first it finds that is not checked.
> 
> Signed-off-by: Larry Finger <Larry.Finger@...inger.net>
> ---
>  drivers/net/wireless/rtlwifi/rtl8723ae/trx.c |   12 ++++++++++++
>  1 file changed, 12 insertions(+)
> 
> diff --git a/drivers/net/wireless/rtlwifi/rtl8723ae/trx.c b/drivers/net/wireless/rtlwifi/rtl8723ae/trx.c
> index 87331d8..7ddd517 100644
> --- a/drivers/net/wireless/rtlwifi/rtl8723ae/trx.c
> +++ b/drivers/net/wireless/rtlwifi/rtl8723ae/trx.c
> @@ -387,6 +387,12 @@ void rtl8723ae_tx_fill_desc(struct ieee80211_hw *hw,
>  					    PCI_DMA_TODEVICE);
>  	u8 bw_40 = 0;
>  
> +	if (pci_dma_mapping_error(rtlpci->pdev, mapping)) {
> +		RT_TRACE(rtlpriv, COMP_SEND, DBG_TRACE,
> +			 "DMA mapping error");
> +		return;
> +	}
> +	CLEAR_PCI_TX_DESC_CONTENT(pdesc, TX_DESC_SIZE);
>  	if (mac->opmode == NL80211_IFTYPE_STATION) {
>  		bw_40 = mac->bw_40;
>  	} else if (mac->opmode == NL80211_IFTYPE_AP ||
> @@ -542,6 +548,12 @@ void rtl8723ae_tx_fill_cmddesc(struct ieee80211_hw *hw,
>  					    PCI_DMA_TODEVICE);
>  	__le16 fc = hdr->frame_control;
>  
> +	if (pci_dma_mapping_error(rtlpci->pdev, mapping)) {
> +		RT_TRACE(rtlpriv, COMP_SEND, DBG_TRACE,
> +			 "DMA mapping error");
> +		return;
> +	}
> +	CLEAR_PCI_TX_DESC_CONTENT(pdesc, TX_DESC_SIZE);
>  	CLEAR_PCI_TX_DESC_CONTENT(pdesc, TX_DESC_SIZE);
>  
>  	if (firstseg)

This seems wrong... 

CLEAR_PCI_TX_DESC_CONTENT(pdesc, TX_DESC_SIZE) doesnt need to be done
twice, does it ?


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