Use dma_{alloc,free}_coherent() to allocate and free the DMA buffers.
This removes the dependancy on VIRT_TO_BUS.
Signed-off-by: H Hartley Sweeten <hswee...@visionengravers.com>
Cc: Ian Abbott <abbo...@mev.co.uk>
Cc: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
drivers/staging/comedi/Kconfig | 2 +-
drivers/staging/comedi/drivers/ni_labpc.h | 4 ++--
drivers/staging/comedi/drivers/ni_labpc_isadma.c | 8 +++++---
3 files changed, 8 insertions(+), 6 deletions(-)
diff --git a/drivers/staging/comedi/Kconfig b/drivers/staging/comedi/Kconfig
index 982b03f..76d66e0 100644
--- a/drivers/staging/comedi/Kconfig
+++ b/drivers/staging/comedi/Kconfig
@@ -502,7 +502,7 @@ config COMEDI_NI_ATMIO16D
config COMEDI_NI_LABPC_ISA
tristate "NI Lab-PC and compatibles ISA support"
select COMEDI_NI_LABPC
- select COMEDI_NI_LABPC_ISADMA if ISA_DMA_API && VIRT_TO_BUS
+ select COMEDI_NI_LABPC_ISADMA if ISA_DMA_API
---help---
Enable support for National Instruments Lab-PC and compatibles
Lab-PC-1200, Lab-PC-1200AI, Lab-PC+.
diff --git a/drivers/staging/comedi/drivers/ni_labpc.h
b/drivers/staging/comedi/drivers/ni_labpc.h
index 7ba7f2f..c26d7ee 100644
--- a/drivers/staging/comedi/drivers/ni_labpc.h
+++ b/drivers/staging/comedi/drivers/ni_labpc.h
@@ -36,8 +36,8 @@ struct labpc_boardinfo {
struct labpc_dma_desc {
unsigned int chan; /* DMA channel */
- u16 *virt_addr; /* virtual address of DMA buffer */
- phys_addr_t hw_addr; /* hardware (bus) address of DMA buffer */
+ void *virt_addr; /* virtual address of DMA buffer */
+ dma_addr_t hw_addr; /* hardware (bus) address of DMA buffer */
unsigned int size; /* size of DMA transfer (in bytes) */
};
diff --git a/drivers/staging/comedi/drivers/ni_labpc_isadma.c
b/drivers/staging/comedi/drivers/ni_labpc_isadma.c
index 829c4e4..ecdbe11 100644
--- a/drivers/staging/comedi/drivers/ni_labpc_isadma.c
+++ b/drivers/staging/comedi/drivers/ni_labpc_isadma.c
@@ -175,14 +175,14 @@ void labpc_init_dma_chan(struct comedi_device *dev,
unsigned int dma_chan)
if (request_dma(dma_chan, dev->board_name))
return;
- dma->virt_addr = kmalloc(dma_buffer_size, GFP_KERNEL | GFP_DMA);
+ dma->virt_addr = dma_alloc_coherent(NULL, dma_buffer_size,
+ &dma->hw_addr, GFP_KERNEL);
if (!dma->virt_addr) {
free_dma(dma_chan);
return;
}
dma->chan = dma_chan;
- dma->hw_addr = virt_to_bus(dma->virt_addr);
dma_flags = claim_dma_lock();
disable_dma(dma->chan);
@@ -196,7 +196,9 @@ void labpc_free_dma_chan(struct comedi_device *dev)
struct labpc_private *devpriv = dev->private;
struct labpc_dma_desc *dma = &devpriv->dma_desc;
- kfree(dma->virt_addr);
+ if (dma->virt_addr)
+ dma_free_coherent(NULL, dma_buffer_size,
+ dma->virt_addr, dma->hw_addr);
if (dma->chan)
free_dma(dma->chan);
}
--
2.0.3
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