From: Malcom Blaney
Date: Tue Jun 16 2009 - 03:29:37 EST


I'm using the parport_pc driver with a dma buffer, which is provided
by calling dma_alloc_coherent in arch/x86/include/asm/dma-mapping.h.

This is no longer working for me in, the previous version I
was using is, which was fine with the same hardware.

The problem is that the call to is_device_dma_capable returns false,
so dma_alloc_coherent returns NULL. Do I need to set the dma_mask in
the driver for this to work correctly?

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