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Commit 5d82720a authored by FUJITA Tomonori's avatar FUJITA Tomonori Committed by Bartlomiej Zolnierkiewicz
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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: default avatarFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
[bart: backport to Linus' tree]
Signed-off-by: default avatarBartlomiej Zolnierkiewicz <bzolnier@gmail.com>
parent 3eb76c1c

drivers/ide/ide-dma.c

+9 −3
Original line number Diff line number Diff line
@@ -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);

include/linux/ide.h

+1 −0
Original line number Diff line number Diff line
@@ -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) */