Commit 2447a27c authored by H Hartley Sweeten's avatar H Hartley Sweeten Committed by Greg Kroah-Hartman
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staging: comedi: ni_at_a2150: use comedi_bytes_per_sample() 



For aesthetics, use the helper function to get the byte size of each sample
instead of using sizeof() the first buffer element.

Signed-off-by: default avatarH Hartley Sweeten <hsweeten@visionengravers.com>
Reviewed-by: default avatarIan Abbott <abbotti@mev.co.uk>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 45478548

drivers/staging/comedi/drivers/ni_at_a2150.c

+4 −4
Original line number Diff line number Diff line
@@ -551,14 +551,14 @@ static int a2150_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s) 
	/*  set size of transfer to fill in 1/3 second */

#define ONE_THIRD_SECOND 333333333

	devpriv->dma_transfer_size =

	    sizeof(devpriv->dma_buffer[0]) * cmd->chanlist_len *

	    comedi_bytes_per_sample(s) * cmd->chanlist_len *

	    ONE_THIRD_SECOND / cmd->scan_begin_arg;

	if (devpriv->dma_transfer_size > A2150_DMA_BUFFER_SIZE)

		devpriv->dma_transfer_size = A2150_DMA_BUFFER_SIZE;

	if (devpriv->dma_transfer_size < sizeof(devpriv->dma_buffer[0]))

		devpriv->dma_transfer_size = sizeof(devpriv->dma_buffer[0]);

	if (devpriv->dma_transfer_size < comedi_bytes_per_sample(s))

		devpriv->dma_transfer_size = comedi_bytes_per_sample(s);

	devpriv->dma_transfer_size -=

	    devpriv->dma_transfer_size % sizeof(devpriv->dma_buffer[0]);

	    devpriv->dma_transfer_size % comedi_bytes_per_sample(s);

	set_dma_count(devpriv->dma, devpriv->dma_transfer_size);

	enable_dma(devpriv->dma);

	release_dma_lock(lock_flags);