According to Documentation/DMA-ISA-LPC.txt, the DMA lock needs to be
claimed before using any of the ISA DMA routines. Introduce a helper
function to disable the ISA DMA controller and add the necessary
locking calls.
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/drivers/pcl812.c | 13 +++++++++++--
1 file changed, 11 insertions(+), 2 deletions(-)
diff --git a/drivers/staging/comedi/drivers/pcl812.c
b/drivers/staging/comedi/drivers/pcl812.c
index 6b38147..c67c2c7 100644
--- a/drivers/staging/comedi/drivers/pcl812.c
+++ b/drivers/staging/comedi/drivers/pcl812.c
@@ -547,6 +547,15 @@ static void pcl812_isadma_program(unsigned int dma_chan,
release_dma_lock(flags);
}
+static void pcl812_isadma_disable(unsigned int dma_chan)
+{
+ unsigned long flags;
+
+ flags = claim_dma_lock();
+ disable_dma(dma_chan);
+ release_dma_lock(flags);
+}
+
static void pcl812_start_pacer(struct comedi_device *dev, bool load_timers)
{
struct pcl812_private *devpriv = dev->private;
@@ -618,7 +627,7 @@ static void pcl812_ai_setup_next_dma(struct comedi_device
*dev,
struct pcl812_private *devpriv = dev->private;
struct pcl812_dma_desc *dma;
- disable_dma(devpriv->dma);
+ pcl812_isadma_disable(devpriv->dma);
devpriv->cur_dma = 1 - devpriv->cur_dma;
dma = &devpriv->dma_desc[devpriv->cur_dma];
@@ -980,7 +989,7 @@ static int pcl812_ai_cancel(struct comedi_device *dev,
struct pcl812_private *devpriv = dev->private;
if (devpriv->ai_dma)
- disable_dma(devpriv->dma);
+ pcl812_isadma_disable(devpriv->dma);
outb(devpriv->mode_reg_int | PCL812_CTRL_DISABLE_TRIG,
dev->iobase + PCL812_CTRL_REG);
--
2.0.3
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