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Date: Fri, 12 Sep 2014 12:19:53 +0100 From: Ian Abbott <abbotti@....co.uk> To: driverdev-devel@...uxdriverproject.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Ian Abbott <abbotti@....co.uk>, H Hartley Sweeten <hartleys@...ionengravers.com>, linux-kernel@...r.kernel.org Subject: [PATCH 0/4] staging: comedi: addi_apci_3120: redo DMA buffer allocation "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(-) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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