b44 driver causes panic when using swiotlb

From: Chuck Ebbert
Date: Mon Jan 31 2011 - 10:57:10 EST

The b44 driver is triggering this panic in swiotlb_map_page():

if (!dma_capable(dev, dev_addr, size))
panic("map_single: bounce buffer is not DMA'ble");

The kernel log says the bounce buffers are at 0xdb400000, but b44 can
only do DMA to the first 1GB of memory:

PCI-DMA: Using software bounce buffering for IO (SWIOTLB)
Placing 64MB software IO TLB between ffff8800db400000 - ffff8800df400000
software IO TLB at phys 0xdb400000 - 0xdf400000
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