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| author | FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> | 2009-03-13 21:16:13 +0100 |
|---|---|---|
| committer | Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> | 2009-03-13 21:16:13 +0100 |
| commit | 5d82720a7f41f0c877e026c7d17e3bf20ccdbae0 (patch) | |
| tree | 47ec22f0bdf7b5eaa79eef17dbacedc29b1123c2 | |
| parent | 3eb76c1ccde496c3c0bfda23d1c803e40b762ce6 (diff) | |
| download | linux-3.10-5d82720a7f41f0c877e026c7d17e3bf20ccdbae0.tar.gz linux-3.10-5d82720a7f41f0c877e026c7d17e3bf20ccdbae0.tar.bz2 linux-3.10-5d82720a7f41f0c877e026c7d17e3bf20ccdbae0.zip | |
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.c | 12 | ||||
| -rw-r--r-- | include/linux/ide.h | 1 |
2 files changed, 10 insertions, 3 deletions
diff --git a/drivers/ide/ide-dma.c b/drivers/ide/ide-dma.c index 72ebab0bc75..059c90bb5ad 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 e0cedfe9fad..25087aead65 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) */ |