staging: comedi: das1800: move dma transfer 'size' to dma descriptor

For asethetics, move the variable that holds the dma transfer 'size' into
the dma descriptor.

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/das1800.c b/drivers/staging/comedi/drivers/das1800.c
index f99aa79..c8ad7dd 100644 (file)
--- a/drivers/staging/comedi/drivers/das1800.c
+++ b/drivers/staging/comedi/drivers/das1800.c
@@ -424,6 +424,7 @@ struct das1800_dma_desc {
        unsigned int chan;      /* DMA channel */
        void *virt_addr;        /* virtual address of DMA buffer */
        dma_addr_t hw_addr;     /* hardware (bus) address of DMA buffer */
+       unsigned int size;      /* transfer size (in bytes) */
 };
 
 struct das1800_private {
@@ -436,7 +437,6 @@ struct das1800_private {
        struct das1800_dma_desc dma_desc[2];
        int cur_dma;
        uint16_t *fifo_buf;     /* bounce buffer for analog input FIFO */
-       unsigned int dma_transfer_size; /* size of transfer currently used, in bytes */
        unsigned long iobase2;  /* secondary io address used for analog out on 'ao' boards */
        unsigned short ao_update_bits;  /* remembers the last write to the
                                         * 'update' dac */
@@ -517,7 +517,6 @@ static void das1800_flush_dma_channel(struct comedi_device *dev,
                                      struct comedi_subdevice *s,
                                      struct das1800_dma_desc *dma)
 {
-       struct das1800_private *devpriv = dev->private;
        unsigned int nbytes;
        unsigned int nsamples;
 
@@ -528,7 +527,7 @@ static void das1800_flush_dma_channel(struct comedi_device *dev,
        clear_dma_ff(dma->chan);
 
        /*  figure out how many points to read */
-       nbytes = devpriv->dma_transfer_size - get_dma_residue(dma->chan);
+       nbytes = dma->size - get_dma_residue(dma->chan);
        nsamples = comedi_bytes_to_samples(s, nbytes);
        nsamples = comedi_nsamples_left(s, nsamples);
 
@@ -574,7 +573,7 @@ static void das1800_handle_dma(struct comedi_device *dev,
        das1800_flush_dma_channel(dev, s, dma);
        /*  re-enable  dma channel */
        set_dma_addr(dma->chan, dma->hw_addr);
-       set_dma_count(dma->chan, devpriv->dma_transfer_size);
+       set_dma_count(dma->chan, dma->size);
        enable_dma(dma->chan);
        release_dma_lock(flags);
 
@@ -1001,6 +1000,7 @@ static void setup_dma(struct comedi_device *dev, const struct comedi_cmd *cmd)
        struct das1800_dma_desc *dma = &devpriv->dma_desc[0];
        unsigned long lock_flags;
        const int dual_dma = devpriv->irq_dma_bits & DMA_DUAL;
+       unsigned int bytes;
 
        if ((devpriv->irq_dma_bits & DMA_ENABLED) == 0)
                return;
@@ -1008,7 +1008,9 @@ static void setup_dma(struct comedi_device *dev, const struct comedi_cmd *cmd)
        devpriv->cur_dma = 0;
 
        /* determine a reasonable dma transfer size */
-       devpriv->dma_transfer_size = suggest_transfer_size(cmd);
+       bytes = suggest_transfer_size(cmd);
+
+       dma->size = bytes;
        lock_flags = claim_dma_lock();
        disable_dma(dma->chan);
        /* clear flip-flop to make sure 2-byte registers for
@@ -1016,18 +1018,19 @@ static void setup_dma(struct comedi_device *dev, const struct comedi_cmd *cmd)
        clear_dma_ff(dma->chan);
        set_dma_addr(dma->chan, dma->hw_addr);
        /*  set appropriate size of transfer */
-       set_dma_count(dma->chan, devpriv->dma_transfer_size);
+       set_dma_count(dma->chan, dma->size);
        enable_dma(dma->chan);
        /*  set up dual dma if appropriate */
        if (dual_dma) {
                dma = &devpriv->dma_desc[1];
+               dma->size = bytes;
                disable_dma(dma->chan);
                /* clear flip-flop to make sure 2-byte registers for
                 * count and address get set correctly */
                clear_dma_ff(dma->chan);
                set_dma_addr(dma->chan, dma->hw_addr);
                /*  set appropriate size of transfer */
-               set_dma_count(dma->chan, devpriv->dma_transfer_size);
+               set_dma_count(dma->chan, dma->size);
                enable_dma(dma->chan);
        }
        release_dma_lock(lock_flags);