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Date:	Wed, 26 Dec 2012 17:17:30 -0600
From:	Larry Finger <Larry.Finger@...inger.net>
To:	Eric Dumazet <eric.dumazet@...il.com>
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 12/26/2012 05:13 PM, Eric Dumazet wrote:
> 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 ?

No it does not. That is a patching error

Thanks,

Larry


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