From afd8f40f6f10bb43c445458a36b873add4dd08f3 Mon Sep 17 00:00:00 2001 From: H Hartley Sweeten Date: Tue, 13 Jan 2015 10:16:38 -0700 Subject: [PATCH] staging: comedi: ni_labpc_isadma: convert 'dma_buffer_size' to a define For aesthetics, convert this statis const global variable to a define. Cleanup the maximum 'size' calc in labpc_suggest_transfer_size(). The modulo operation will always result in '0'. Signed-off-by: H Hartley Sweeten Reviewed-by: Ian Abbott Signed-off-by: Greg Kroah-Hartman --- drivers/staging/comedi/drivers/ni_labpc_isadma.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/drivers/staging/comedi/drivers/ni_labpc_isadma.c b/drivers/staging/comedi/drivers/ni_labpc_isadma.c index 43e4f99f25df..0ce8aad2f342 100644 --- a/drivers/staging/comedi/drivers/ni_labpc_isadma.c +++ b/drivers/staging/comedi/drivers/ni_labpc_isadma.c @@ -29,7 +29,7 @@ #include "ni_labpc_isadma.h" /* size in bytes of dma buffer */ -static const int dma_buffer_size = 0xff00; +#define LABPC_ISADMA_BUFFER_SIZE 0xff00 /* utility function that suggests a dma transfer size in bytes */ static unsigned int labpc_suggest_transfer_size(struct comedi_device *dev, @@ -50,8 +50,8 @@ static unsigned int labpc_suggest_transfer_size(struct comedi_device *dev, size = (freq / 3) * sample_size; /* set a minimum and maximum size allowed */ - if (size > dma_buffer_size) - size = dma_buffer_size - dma_buffer_size % sample_size; + if (size > LABPC_ISADMA_BUFFER_SIZE) + size = LABPC_ISADMA_BUFFER_SIZE; else if (size < sample_size) size = sample_size; @@ -178,7 +178,7 @@ 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 = dma_alloc_coherent(NULL, dma_buffer_size, + dma->virt_addr = dma_alloc_coherent(NULL, LABPC_ISADMA_BUFFER_SIZE, &dma->hw_addr, GFP_KERNEL); if (!dma->virt_addr) { free_dma(dma_chan); @@ -200,7 +200,7 @@ void labpc_free_dma_chan(struct comedi_device *dev) struct labpc_dma_desc *dma = &devpriv->dma_desc; if (dma->virt_addr) - dma_free_coherent(NULL, dma_buffer_size, + dma_free_coherent(NULL, LABPC_ISADMA_BUFFER_SIZE, dma->virt_addr, dma->hw_addr); if (dma->chan) free_dma(dma->chan); -- 2.20.1