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authorDarrick J. Wong <djwong@us.ibm.com>2006-11-10 16:59:24 -0800
committerJames Bottomley <jejb@mulgrave.localdomain>2007-07-18 11:14:47 -0500
commitba330ffebb43c37cabc765c7cb0a80df01554657 (patch)
treed703cb707917d1ce5daf0224b3d10b51c8825415 /drivers/scsi/aic94xx
parent338ec57003ff9d7bc1471677e61872455977a5de (diff)
downloadop-kernel-dev-ba330ffebb43c37cabc765c7cb0a80df01554657.zip
op-kernel-dev-ba330ffebb43c37cabc765c7cb0a80df01554657.tar.gz
[SCSI] aic94xx: Don't call pci_map_sg for already-mapped scatterlists
It turns out that libata has already dma_map_sg'd the scatterlist entries that go with an ata_queued_cmd by the time it calls sas_ata_qc_issue. sas_ata_qc_issue passes this scatterlist to aic94xx. Unfortunately, aic94xx assumes that any scatterlist passed to it needs to be pci_map_sg'd... which blows away the mapping that libata created! This causes (on a x260) Calgary IOMMU table leaks and duplicate frees when aic94xx and libata try to {pci,dma}_unmap_sg the scatterlist. Signed-off-by: Darrick J. Wong <djwong@us.ibm.com> Key this check off ATA_PROTOCOL_STP Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
Diffstat (limited to 'drivers/scsi/aic94xx')
-rw-r--r--drivers/scsi/aic94xx/aic94xx_task.c19
1 files changed, 13 insertions, 6 deletions
diff --git a/drivers/scsi/aic94xx/aic94xx_task.c b/drivers/scsi/aic94xx/aic94xx_task.c
index 9b65abe..6c12c0f 100644
--- a/drivers/scsi/aic94xx/aic94xx_task.c
+++ b/drivers/scsi/aic94xx/aic94xx_task.c
@@ -74,8 +74,13 @@ static inline int asd_map_scatterlist(struct sas_task *task,
return 0;
}
- num_sg = pci_map_sg(asd_ha->pcidev, task->scatter, task->num_scatter,
- task->data_dir);
+ /* STP tasks come from libata which has already mapped
+ * the SG list */
+ if (task->task_proto == SAS_PROTOCOL_STP)
+ num_sg = task->num_scatter;
+ else
+ num_sg = pci_map_sg(asd_ha->pcidev, task->scatter,
+ task->num_scatter, task->data_dir);
if (num_sg == 0)
return -ENOMEM;
@@ -120,8 +125,9 @@ static inline int asd_map_scatterlist(struct sas_task *task,
return 0;
err_unmap:
- pci_unmap_sg(asd_ha->pcidev, task->scatter, task->num_scatter,
- task->data_dir);
+ if (task->task_proto != SAS_PROTOCOL_STP)
+ pci_unmap_sg(asd_ha->pcidev, task->scatter, task->num_scatter,
+ task->data_dir);
return res;
}
@@ -142,8 +148,9 @@ static inline void asd_unmap_scatterlist(struct asd_ascb *ascb)
}
asd_free_coherent(asd_ha, ascb->sg_arr);
- pci_unmap_sg(asd_ha->pcidev, task->scatter, task->num_scatter,
- task->data_dir);
+ if (task->task_proto != SAS_PROTOCOL_STP)
+ pci_unmap_sg(asd_ha->pcidev, task->scatter, task->num_scatter,
+ task->data_dir);
}
/* ---------- Task complete tasklet ---------- */
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