staging: comedi: pcl812: remove 'ai_data_len' from private data

This member of the private data is only used in the initial dma setup.
Refactor that code to not need it and remove the member.

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>

diff --git a/drivers/staging/comedi/drivers/pcl812.c b/drivers/staging/comedi/drivers/pcl812.c
index c7916e4..d67df0a 100644 (file)
--- a/drivers/staging/comedi/drivers/pcl812.c
+++ b/drivers/staging/comedi/drivers/pcl812.c
@@ -511,7 +511,6 @@ struct pcl812_private {
        unsigned char mode_reg_int;     /*  there is stored INT number for some card */
        unsigned int ai_poll_ptr;       /*  how many sampes transfer poll */
        unsigned int ai_act_scan;       /*  how many scans we finished */
-       unsigned int ai_data_len;       /*  len of data buffer */
        unsigned int dmapages;
        unsigned int hwdmasize;
        unsigned long dmabuf[2];        /*  PTR to DMA buf */
@@ -568,11 +567,11 @@ static void pcl812_ai_setup_dma(struct comedi_device *dev,
        } else {
                devpriv->dmabytestomove[0] = devpriv->hwdmasize;
                devpriv->dmabytestomove[1] = devpriv->hwdmasize;
-               if (devpriv->ai_data_len < devpriv->hwdmasize) {
+               if (s->async->prealloc_bufsz < devpriv->hwdmasize) {
                        devpriv->dmabytestomove[0] =
-                               devpriv->ai_data_len;
+                               s->async->prealloc_bufsz;
                        devpriv->dmabytestomove[1] =
-                               devpriv->ai_data_len;
+                               s->async->prealloc_bufsz;
                }
                if (cmd->stop_src == TRIG_NONE) {
                        devpriv->dma_runs_to_end = 1;
@@ -856,7 +855,6 @@ static int pcl812_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
        } else
                devpriv->ai_dma = 0;
 
-       devpriv->ai_data_len = s->async->prealloc_bufsz;
        devpriv->ai_act_scan = 0;
        devpriv->ai_poll_ptr = 0;
        s->async->cur_chan = 0;