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authorFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>2009-02-27 17:35:43 +0900
committerJeff Garzik <jgarzik@redhat.com>2009-03-05 07:24:57 -0500
commit5825627c9463581fd9e70f8285685889ae5bb9bb (patch)
tree321a20a0e25aee8f32254b13730f423f6b434486
parente7d3ef13d52a126438f687a1a32da65ff926ed57 (diff)
libata: fix dma_unmap_sg misuse
libata passes the returned value of dma_map_sg() to dma_unmap_sg(),which is the misuse of dma_unmap_sg(). DMA-mapping.txt says: To unmap a scatterlist, just call: pci_unmap_sg(pdev, sglist, nents, direction); Again, make sure DMA activity has already finished. PLEASE NOTE: The 'nents' argument to the pci_unmap_sg call must be the _same_ one you passed into the pci_map_sg call, it should _NOT_ be the 'count' value _returned_ from the pci_map_sg call. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Acked-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> Acked-by: Tejun Heo <tj@kernel.org> Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
-rw-r--r--drivers/ata/libata-core.c4
-rw-r--r--include/linux/libata.h1
2 files changed, 3 insertions, 2 deletions
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 9fbf0595f3d..5e324cea301 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -4612,7 +4612,7 @@ void ata_sg_clean(struct ata_queued_cmd *qc)
VPRINTK("unmapping %u sg elements\n", qc->n_elem);
if (qc->n_elem)
- dma_unmap_sg(ap->dev, sg, qc->n_elem, dir);
+ dma_unmap_sg(ap->dev, sg, qc->orig_n_elem, dir);
qc->flags &= ~ATA_QCFLAG_DMAMAP;
qc->sg = NULL;
@@ -4727,7 +4727,7 @@ static int ata_sg_setup(struct ata_queued_cmd *qc)
return -1;
DPRINTK("%d sg elements mapped\n", n_elem);
-
+ qc->orig_n_elem = qc->n_elem;
qc->n_elem = n_elem;
qc->flags |= ATA_QCFLAG_DMAMAP;
diff --git a/include/linux/libata.h b/include/linux/libata.h
index dd818c7decd..fbf064e13ad 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -530,6 +530,7 @@ struct ata_queued_cmd {
unsigned long flags; /* ATA_QCFLAG_xxx */
unsigned int tag;
unsigned int n_elem;
+ unsigned int orig_n_elem;
int dma_dir;