From 4efc4bbdc1602d887d784be629a7a4efbf6b6e19 Mon Sep 17 00:00:00 2001 From: Ian Abbott Date: Fri, 10 May 2013 14:07:15 +0100 Subject: [PATCH] staging: comedi: work without HAS_DMA The core "comedi" module and the "mite" helper module for NI PCI devices both have calls to `dma_alloc_coherent()` and `dma_free_coherent()`. Those functions are only available if `CONFIG_HAS_DMA` is defined. Apart from the "mite" module, the functions are only called for comedi drivers that set `s->async_dma_dir` (where `s` is a pointer to a `struct comedi_subdevice`) to anything other than `DMA_NONE`. Change local helper functions `__comedi_buf_alloc()` and `__comedi_buf_free()` to only call `dma_alloc_coherent()` and `dma_free_coherent()` if `CONFIG_HAS_DMA` is defined. Change the "Kconfig" to make the following configuration options depend on `HAS_DMA`: `COMEDI_MITE` - builds the "mite" module. `COMEDI_NI_6527` - selects `COMEDI_MITE`. `COMEDI_NI_65XX` - selects `COMEDI_MITE`. `COMEDI_NI_670X` - selects `COMEDI_MITE`. `COMEDI_NI_LABPC_PCI` - selects `COMEDI_MITE`. `COMEDI_NI_PCIDIO` - selects `COMEDI_MITE`. `COMEDI_NI_TIOCMD` - selects `COMEDI_MITE`. `COMEDI_NI_660X` - selects `COMEDI_NI_TIOCMD`, sets `s->async_dma_dir`. `COMEDI_NI_PCIMIO` - selects `COMEDI_NI_TIOCMD`, sets `s->async_dma_dir`. Signed-off-by: Ian Abbott Reviewed-by: H Hartley Sweeten Signed-off-by: Greg Kroah-Hartman --- drivers/staging/comedi/Kconfig | 9 +++++++++ drivers/staging/comedi/comedi_buf.c | 6 ++++++ 2 files changed, 15 insertions(+) diff --git a/drivers/staging/comedi/Kconfig b/drivers/staging/comedi/Kconfig index 7871579bb83d..87e852a0ef49 100644 --- a/drivers/staging/comedi/Kconfig +++ b/drivers/staging/comedi/Kconfig @@ -981,6 +981,7 @@ config COMEDI_ME_DAQ config COMEDI_NI_6527 tristate "NI 6527 support" + depends on HAS_DMA select COMEDI_MITE ---help--- Enable support for the National Instruments 6527 PCI card @@ -990,6 +991,7 @@ config COMEDI_NI_6527 config COMEDI_NI_65XX tristate "NI 65xx static dio PCI card support" + depends on HAS_DMA select COMEDI_MITE ---help--- Enable support for National Instruments 65xx static dio boards. @@ -1003,6 +1005,7 @@ config COMEDI_NI_65XX config COMEDI_NI_660X tristate "NI 660x counter/timer PCI card support" + depends on HAS_DMA select COMEDI_NI_TIOCMD ---help--- Enable support for National Instruments PCI-6601 (ni_660x), PCI-6602, @@ -1013,6 +1016,7 @@ config COMEDI_NI_660X config COMEDI_NI_670X tristate "NI 670x PCI card support" + depends on HAS_DMA select COMEDI_MITE ---help--- Enable support for National Instruments PCI-6703 and PCI-6704 @@ -1022,6 +1026,7 @@ config COMEDI_NI_670X config COMEDI_NI_LABPC_PCI tristate "NI Lab-PC PCI-1200 support" + depends on HAS_DMA select COMEDI_NI_LABPC select COMEDI_MITE ---help--- @@ -1032,6 +1037,7 @@ config COMEDI_NI_LABPC_PCI config COMEDI_NI_PCIDIO tristate "NI PCI-DIO32HS, PCI-6533, PCI-6534 support" + depends on HAS_DMA select COMEDI_MITE select COMEDI_8255 ---help--- @@ -1043,6 +1049,7 @@ config COMEDI_NI_PCIDIO config COMEDI_NI_PCIMIO tristate "NI PCI-MIO-E series and M series support" + depends on HAS_DMA select COMEDI_NI_TIOCMD select COMEDI_8255 select COMEDI_FC @@ -1095,10 +1102,12 @@ config COMEDI_SSV_DNP called ssv_dnp. config COMEDI_MITE + depends on HAS_DMA tristate config COMEDI_NI_TIOCMD tristate + depends on HAS_DMA select COMEDI_NI_TIO select COMEDI_MITE diff --git a/drivers/staging/comedi/comedi_buf.c b/drivers/staging/comedi/comedi_buf.c index ca709901fb3e..b6cd67ad55d1 100644 --- a/drivers/staging/comedi/comedi_buf.c +++ b/drivers/staging/comedi/comedi_buf.c @@ -51,10 +51,12 @@ static void __comedi_buf_free(struct comedi_device *dev, clear_bit(PG_reserved, &(virt_to_page(buf->virt_addr)->flags)); if (s->async_dma_dir != DMA_NONE) { +#ifdef CONFIG_HAS_DMA dma_free_coherent(dev->hw_dev, PAGE_SIZE, buf->virt_addr, buf->dma_addr); +#endif } else { free_page((unsigned long)buf->virt_addr); } @@ -84,11 +86,15 @@ static void __comedi_buf_alloc(struct comedi_device *dev, for (i = 0; i < n_pages; i++) { buf = &async->buf_page_list[i]; if (s->async_dma_dir != DMA_NONE) +#ifdef CONFIG_HAS_DMA buf->virt_addr = dma_alloc_coherent(dev->hw_dev, PAGE_SIZE, &buf->dma_addr, GFP_KERNEL | __GFP_COMP); +#else + break; +#endif else buf->virt_addr = (void *)get_zeroed_page(GFP_KERNEL); if (!buf->virt_addr) -- 2.20.1