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authorFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>2009-03-13 21:16:13 +0100
committerBartlomiej Zolnierkiewicz <bzolnier@gmail.com>2009-03-13 21:16:13 +0100
commit5d82720a7f41f0c877e026c7d17e3bf20ccdbae0 (patch)
tree47ec22f0bdf7b5eaa79eef17dbacedc29b1123c2
parent3eb76c1ccde496c3c0bfda23d1c803e40b762ce6 (diff)
ide: save the returned value of dma_map_sg
dma_map_sg could return a value different to 'nents' argument of dma_map_sg so the ide stack needs to save it for the later usage (e.g. for_each_sg). The ide stack also needs to save the original sg_nents value for pci_unmap_sg. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> [bart: backport to Linus' tree] Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
-rw-r--r--drivers/ide/ide-dma.c12
-rw-r--r--include/linux/ide.h1
2 files changed, 10 insertions, 3 deletions
diff --git a/drivers/ide/ide-dma.c b/drivers/ide/ide-dma.c
index 72ebab0bc755..059c90bb5ad2 100644
--- a/drivers/ide/ide-dma.c
+++ b/drivers/ide/ide-dma.c
@@ -128,6 +128,7 @@ int ide_build_sglist(ide_drive_t *drive, struct request *rq)
{
ide_hwif_t *hwif = drive->hwif;
struct scatterlist *sg = hwif->sg_table;
+ int i;
ide_map_sg(drive, rq);
@@ -136,8 +137,13 @@ int ide_build_sglist(ide_drive_t *drive, struct request *rq)
else
hwif->sg_dma_direction = DMA_TO_DEVICE;
- return dma_map_sg(hwif->dev, sg, hwif->sg_nents,
- hwif->sg_dma_direction);
+ i = dma_map_sg(hwif->dev, sg, hwif->sg_nents, hwif->sg_dma_direction);
+ if (i) {
+ hwif->orig_sg_nents = hwif->sg_nents;
+ hwif->sg_nents = i;
+ }
+
+ return i;
}
EXPORT_SYMBOL_GPL(ide_build_sglist);
@@ -156,7 +162,7 @@ void ide_destroy_dmatable(ide_drive_t *drive)
{
ide_hwif_t *hwif = drive->hwif;
- dma_unmap_sg(hwif->dev, hwif->sg_table, hwif->sg_nents,
+ dma_unmap_sg(hwif->dev, hwif->sg_table, hwif->orig_sg_nents,
hwif->sg_dma_direction);
}
EXPORT_SYMBOL_GPL(ide_destroy_dmatable);
diff --git a/include/linux/ide.h b/include/linux/ide.h
index e0cedfe9fad4..25087aead657 100644
--- a/include/linux/ide.h
+++ b/include/linux/ide.h
@@ -797,6 +797,7 @@ typedef struct hwif_s {
struct scatterlist *sg_table;
int sg_max_nents; /* Maximum number of entries in it */
int sg_nents; /* Current number of entries in it */
+ int orig_sg_nents;
int sg_dma_direction; /* dma transfer direction */
/* data phase of the active command (currently only valid for PIO/DMA) */