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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>
This commit is contained in:
FUJITA Tomonori 2009-03-13 21:16:13 +01:00 committed by Bartlomiej Zolnierkiewicz
parent 3eb76c1ccd
commit 5d82720a7f
2 changed files with 10 additions and 3 deletions
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12
drivers/ide/ide-dma.c
View File

@ -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);

1
include/linux/ide.h
View File

@ -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) */