diff options
| author | Darrick J. Wong <djwong@us.ibm.com> | 2006-11-10 16:59:24 -0800 |
|---|---|---|
| committer | James Bottomley <jejb@mulgrave.localdomain> | 2007-07-18 11:14:47 -0500 |
| commit | ba330ffebb43c37cabc765c7cb0a80df01554657 (patch) | |
| tree | d703cb707917d1ce5daf0224b3d10b51c8825415 /drivers/scsi/aic94xx/aic94xx_task.c | |
| parent | 338ec57003ff9d7bc1471677e61872455977a5de (diff) | |
| download | lwn-ba330ffebb43c37cabc765c7cb0a80df01554657.tar.gz lwn-ba330ffebb43c37cabc765c7cb0a80df01554657.zip | |
[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/aic94xx_task.c')
| -rw-r--r-- | drivers/scsi/aic94xx/aic94xx_task.c | 19 |
1 files changed, 13 insertions, 6 deletions
diff --git a/drivers/scsi/aic94xx/aic94xx_task.c b/drivers/scsi/aic94xx/aic94xx_task.c index 9b65abec2f6e..6c12c0f19f39 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 ---------- */ |