RE: [PATCH 0/4] staging: comedi: addi_apci_3120: redo DMA buffer allocation

[Hartley Sweeten]

On Friday, September 12, 2014 4:20 AM, Ian Abbott wrote:
> "addi_apci_3120" allocates more pages of DMA buffer than it uses, may
> allocate half a double-buffer it does not use because it's the "wrong"
> half that it managed to allocate (unlikely), and relies on virt_to_bus()
> to treat generic kernel memory from get_free_pages() as coherent DMA
> memory.  Correct the issues, using dma_alloc_coherent() to allocate the
> DMA buffers.
>
> 1) staging: comedi: addi_apci_3120: don't allocate 2nd DMA buffer on failure
> 2) staging: comedi: addi_apci_3120: don't overallocate DMA buffer
> 3) staging: comedi: addi_apci_3120: use dma_alloc_coherent()
> 4) staging: comedi: addi_apci_3120: simplify setting of devpriv->us_UseDma
>
>  drivers/staging/comedi/Kconfig                     |  2 +-
>  .../staging/comedi/drivers/addi-data/addi_common.h |  3 +-
>  drivers/staging/comedi/drivers/addi_apci_3120.c    | 44 ++++++++++------------
>  3 files changed, 22 insertions(+), 27 deletions(-)

Reviewed-by: H Hartley Sweeten <hsweeten@xxxxxxxxxxxxxxxxxxx>

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