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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 <abbotti@mev.co.uk>
Reviewed-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ian Abbott 2013-05-10 14:07:15 +01:00 committed by Greg Kroah-Hartman
parent b3fab42773
commit 4efc4bbdc1
2 changed files with 15 additions and 0 deletions
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9
drivers/staging/comedi/Kconfig
View File

@ -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

6
drivers/staging/comedi/comedi_buf.c
View File

@ -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)