linux-kernel - Re: [PATCH 18/20] [SCSI] mpt3sas: Call dma_mapping_error() API after mapping an address with dma_map

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Message-ID: <20150615095546.GI5660@c203.arch.suse.de>
Date:	Mon, 15 Jun 2015 11:55:46 +0200
From:	Johannes Thumshirn <jthumshirn@...e.de>
To:	Sreekanth Reddy <sreekanth.reddy@...gotech.com>
Cc:	jejb@...nel.org, hch@...radead.org, martin.petersen@...cle.com,
	linux-scsi@...r.kernel.org, JBottomley@...allels.com,
	Sathya.Prakash@...gotech.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 18/20] [SCSI] mpt3sas: Call dma_mapping_error() API after
 mapping an address with dma_map_single() API

On Fri, Jun 12, 2015 at 03:12:30PM +0530, Sreekanth Reddy wrote:
> Added dma_mapping_error() API after mapping an address with dma_map_single() API.
> Otherwise when CONFIG_DMA_API_DEBUG is enabled in the kernel, then it complains
> about mpt3sas driver not calling dma_mapping_error after mapping an address with
> dma_map_single
> 
> Signed-off-by: Sreekanth Reddy <Sreekanth.Reddy@...gotech.com>
> ---
>  drivers/scsi/mpt3sas/mpt3sas_transport.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/scsi/mpt3sas/mpt3sas_transport.c b/drivers/scsi/mpt3sas/mpt3sas_transport.c
> index 7a7aa68..70fd019 100644
> --- a/drivers/scsi/mpt3sas/mpt3sas_transport.c
> +++ b/drivers/scsi/mpt3sas/mpt3sas_transport.c
> @@ -1964,7 +1964,7 @@ _transport_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
>  	} else {
>  		dma_addr_out = pci_map_single(ioc->pdev, bio_data(req->bio),
>  		    blk_rq_bytes(req), PCI_DMA_BIDIRECTIONAL);
> -		if (!dma_addr_out) {
> +		if (pci_dma_mapping_error(ioc->pdev, dma_addr_out)) {
>  			pr_info(MPT3SAS_FMT "%s(): DMA Addr out = NULL\n",
>  			    ioc->name, __func__);
>  			rc = -ENOMEM;
> @@ -1986,7 +1986,7 @@ _transport_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
>  	} else {
>  		dma_addr_in =  pci_map_single(ioc->pdev, bio_data(rsp->bio),
>  		    blk_rq_bytes(rsp), PCI_DMA_BIDIRECTIONAL);
> -		if (!dma_addr_in) {
> +		if (pci_dma_mapping_error(ioc->pdev, dma_addr_in)) {
>  			pr_info(MPT3SAS_FMT "%s(): DMA Addr in = NULL\n",
>  			    ioc->name, __func__);
>  			rc = -ENOMEM;
> -- 
> 2.0.2
> 
> --
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Reviewed-by: Johannes Thumshirn <jthumshirn@...e.de>

-- 
Johannes Thumshirn                                       Storage
jthumshirn@...e.de                             +49 911 74053 689
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
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