diff options
| author | Marek Szyprowski <m.szyprowski@samsung.com> | 2020-09-04 15:17:10 +0200 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab+huawei@kernel.org> | 2020-09-26 10:34:44 +0200 |
| commit | f95fc014e036c06203c0c5d75045e4ac890ef335 (patch) | |
| tree | 75019c755330afaabc941f582b7ce26fd733209b /drivers/media/pci/saa7134 | |
| parent | ab11fae0be7a7bcb7aec75c5b081d37ed0a0ed08 (diff) | |
| download | linux-f95fc014e036c06203c0c5d75045e4ac890ef335.tar.gz | |
media: pci: fix common ALSA DMA-mapping related codes
The Documentation/DMA-API-HOWTO.txt states that dma_map_sg returns the
numer of the created entries in the DMA address space. However the
subsequent calls to dma_sync_sg_for_{device,cpu} and dma_unmap_sg must be
called with the original number of entries passed to dma_map_sg. The
sg_table->nents in turn holds the result of the dma_map_sg call as stated
in include/linux/scatterlist.h. Adapt the code to obey those rules.
While touching this code, update it to use the modern DMA_FROM_DEVICE
definitions.
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Diffstat (limited to 'drivers/media/pci/saa7134')
| -rw-r--r-- | drivers/media/pci/saa7134/saa7134-alsa.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/media/pci/saa7134/saa7134-alsa.c b/drivers/media/pci/saa7134/saa7134-alsa.c index 347ecb0bab2f..7a1fb067b0e0 100644 --- a/drivers/media/pci/saa7134/saa7134-alsa.c +++ b/drivers/media/pci/saa7134/saa7134-alsa.c @@ -298,7 +298,7 @@ static int saa7134_alsa_dma_map(struct saa7134_dev *dev) struct saa7134_dmasound *dma = &dev->dmasound; dma->sglen = dma_map_sg(&dev->pci->dev, dma->sglist, - dma->nr_pages, PCI_DMA_FROMDEVICE); + dma->nr_pages, DMA_FROM_DEVICE); if (0 == dma->sglen) { pr_warn("%s: saa7134_alsa_map_sg failed\n", __func__); @@ -314,7 +314,7 @@ static int saa7134_alsa_dma_unmap(struct saa7134_dev *dev) if (!dma->sglen) return 0; - dma_unmap_sg(&dev->pci->dev, dma->sglist, dma->sglen, PCI_DMA_FROMDEVICE); + dma_unmap_sg(&dev->pci->dev, dma->sglist, dma->nr_pages, DMA_FROM_DEVICE); dma->sglen = 0; return 0; } |