diff options
Diffstat (limited to 'drivers/staging/comedi/drivers/comedi_isadma.c')
| -rw-r--r-- | drivers/staging/comedi/drivers/comedi_isadma.c | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/drivers/staging/comedi/drivers/comedi_isadma.c b/drivers/staging/comedi/drivers/comedi_isadma.c index b77dc8d5d3ff..c729094298c2 100644 --- a/drivers/staging/comedi/drivers/comedi_isadma.c +++ b/drivers/staging/comedi/drivers/comedi_isadma.c @@ -172,6 +172,19 @@ struct comedi_isadma *comedi_isadma_alloc(struct comedi_device *dev, goto no_dma; dma->desc = desc; dma->n_desc = n_desc; + if (dev->hw_dev) { + dma->dev = dev->hw_dev; + } else { + /* Fall back to using the "class" device. */ + if (!dev->class_dev) + goto no_dma; + /* Need 24-bit mask for ISA DMA. */ + if (dma_coerce_mask_and_coherent(dev->class_dev, + DMA_BIT_MASK(24))) { + goto no_dma; + } + dma->dev = dev->class_dev; + } dma_chans[0] = dma_chan1; if (dma_chan2 == 0 || dma_chan2 == dma_chan1) @@ -192,7 +205,7 @@ struct comedi_isadma *comedi_isadma_alloc(struct comedi_device *dev, desc = &dma->desc[i]; desc->chan = dma_chans[i]; desc->maxsize = maxsize; - desc->virt_addr = dma_alloc_coherent(NULL, desc->maxsize, + desc->virt_addr = dma_alloc_coherent(dma->dev, desc->maxsize, &desc->hw_addr, GFP_KERNEL); if (!desc->virt_addr) @@ -224,7 +237,7 @@ void comedi_isadma_free(struct comedi_isadma *dma) for (i = 0; i < dma->n_desc; i++) { desc = &dma->desc[i]; if (desc->virt_addr) - dma_free_coherent(NULL, desc->maxsize, + dma_free_coherent(dma->dev, desc->maxsize, desc->virt_addr, desc->hw_addr); } |