linux-kernel - [PATCH 1/2] drivers: scsi: mpt2sas: Added pci_dma_mapping

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Date:	Sun, 18 Jan 2015 12:11:02 +0530
From:	Tina Johnson <tinajohnson.1234@...il.com>
To:	JBottomley@...allels.com
Cc:	praveen.krishnamoorthy@...gotech.com,
	sreekanth.reddy@...gotech.com, julia.lawall@...6.fr,
	abhijit.mahajan@...gotech.com, nagalakshmi.nandigama@...gotech.com,
	MPT-FusionLinux.pdl@...gotech.com, linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Tina Johnson <tinajohnson.1234@...il.com>
Subject: [PATCH 1/2] drivers: scsi: mpt2sas: Added pci_dma_mapping_error() call

Replaced null test on dma handle with  pci_dma_mapping_error()
o check for mapping errors. Coccinelle was used to find cases
that do not check for dma mapping errors:

@rule1@
statement S;
identifier x;
@@

*x = pci_map_single(...);
  if (!x) S

Signed-off-by: Tina Johnson <tinajohnson.1234@...il.com>
Acked-by: Julia Lawall <julia.lawall@...6.fr>
---
 drivers/scsi/mpt2sas/mpt2sas_transport.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/mpt2sas/mpt2sas_transport.c b/drivers/scsi/mpt2sas/mpt2sas_transport.c
index e689bf2..b283140 100644
--- a/drivers/scsi/mpt2sas/mpt2sas_transport.c
+++ b/drivers/scsi/mpt2sas/mpt2sas_transport.c
@@ -1962,7 +1962,7 @@ _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)) {
 			printk(MPT2SAS_INFO_FMT "%s(): DMA Addr out = NULL\n",
 			    ioc->name, __func__);
 			rc = -ENOMEM;
@@ -1984,7 +1984,7 @@ _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)) {
 			printk(MPT2SAS_INFO_FMT "%s(): DMA Addr in = NULL\n",
 			    ioc->name, __func__);
 			rc = -ENOMEM;
-- 
1.7.10.4

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