diff options
| author | H Hartley Sweeten <hsweeten@visionengravers.com> | 2015-01-12 10:55:53 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-01-17 14:25:20 -0800 |
| commit | 9ff24fd577fdc6744ca328bdee59133b1094aede (patch) | |
| tree | b4d533629cb66829f797b4b3f7bd7018f4003702 /drivers/staging/comedi/drivers/ni_labpc_isadma.c | |
| parent | 4d1c15c08f6620ac912d56a800a0322e64a7e3e5 (diff) | |
staging: comedi: ni_labpc_isadma: tidy up labpc_init_dma_chan()
DMA support is optional for the labpc driver. The return value from
labpc_init_dma_chan() is not even checked by the caller.
Change the return type to void and tidy up the function a bit.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/staging/comedi/drivers/ni_labpc_isadma.c')
| -rw-r--r-- | drivers/staging/comedi/drivers/ni_labpc_isadma.c | 22 |
1 files changed, 8 insertions, 14 deletions
diff --git a/drivers/staging/comedi/drivers/ni_labpc_isadma.c b/drivers/staging/comedi/drivers/ni_labpc_isadma.c index b7217a76df67..829c4e447912 100644 --- a/drivers/staging/comedi/drivers/ni_labpc_isadma.c +++ b/drivers/staging/comedi/drivers/ni_labpc_isadma.c @@ -163,28 +163,24 @@ void labpc_handle_dma_status(struct comedi_device *dev) } EXPORT_SYMBOL_GPL(labpc_handle_dma_status); -int labpc_init_dma_chan(struct comedi_device *dev, unsigned int dma_chan) +void labpc_init_dma_chan(struct comedi_device *dev, unsigned int dma_chan) { struct labpc_private *devpriv = dev->private; struct labpc_dma_desc *dma = &devpriv->dma_desc; - void *dma_buffer; unsigned long dma_flags; - int ret; if (dma_chan != 1 && dma_chan != 3) - return -EINVAL; + return; - dma_buffer = kmalloc(dma_buffer_size, GFP_KERNEL | GFP_DMA); - if (!dma_buffer) - return -ENOMEM; + if (request_dma(dma_chan, dev->board_name)) + return; - ret = request_dma(dma_chan, dev->board_name); - if (ret) { - kfree(dma_buffer); - return ret; + dma->virt_addr = kmalloc(dma_buffer_size, GFP_KERNEL | GFP_DMA); + if (!dma->virt_addr) { + free_dma(dma_chan); + return; } - dma->virt_addr = dma_buffer; dma->chan = dma_chan; dma->hw_addr = virt_to_bus(dma->virt_addr); @@ -192,8 +188,6 @@ int labpc_init_dma_chan(struct comedi_device *dev, unsigned int dma_chan) disable_dma(dma->chan); set_dma_mode(dma->chan, DMA_MODE_READ); release_dma_lock(dma_flags); - - return 0; } EXPORT_SYMBOL_GPL(labpc_init_dma_chan); |