linux-kernel - Re: [PATCH v2] mptlan: add checks for dma mapping errors

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Date:	Mon, 25 Jan 2016 18:08:27 +0100
From:	Alexey Khoroshilov <khoroshilov@...ras.ru>
To:	Tomas Henzl <thenzl@...hat.com>,
	Sreekanth Reddy <sreekanth.reddy@...gotech.com>
Cc:	MPT-FusionLinux.pdl@...gotech.com, linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org, ldv-project@...uxtesting.org
Subject: Re: [PATCH v2] mptlan: add checks for dma mapping errors

On 25.01.2016 16:36, Tomas Henzl wrote:
> On 23.1.2016 01:41, Alexey Khoroshilov wrote:
>> mpt_lan_sdu_send() and mpt_lan_post_receive_buckets() do not check
>> if mapping dma memory succeed.
>> The patch adds the checks and failure handling.
>>
>> Found by Linux Driver Verification project (linuxtesting.org).
>>
>> Signed-off-by: Alexey Khoroshilov <khoroshilov@...ras.ru>
>> ---
>>  drivers/message/fusion/mptlan.c | 14 ++++++++++++++
>>  1 file changed, 14 insertions(+)
>>
>> diff --git a/drivers/message/fusion/mptlan.c b/drivers/message/fusion/mptlan.c
>> index cbe96072a6cc..3b6c8a755713 100644
>> --- a/drivers/message/fusion/mptlan.c
>> +++ b/drivers/message/fusion/mptlan.c
>> @@ -734,6 +734,12 @@ mpt_lan_sdu_send (struct sk_buff *skb, struct net_device *dev)
>>  
>>          dma = pci_map_single(mpt_dev->pcidev, skb->data, skb->len,
>>  			     PCI_DMA_TODEVICE);
>> +	if (pci_dma_mapping_error(mpt_dev->pcidev, dma)) {
>> +		netif_stop_queue(dev);
> 
> Hi Alexey,
> isn't a mpt_put_msg_frame needed here ?
> and a similar de-alloc in next chunk too?
> -tms

Hi Tomas,

You are right, thank you!
I'll resend the patch.

--
Alexey