linux-kernel - b44 driver causes panic when using swiotlb

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Date:	Mon, 31 Jan 2011 10:54:12 -0500
From:	Chuck Ebbert <cebbert@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	Andi Kleen <ak@...ux.intel.com>,
	David Woodhouse <dwmw2@...radead.org>
Subject: b44 driver causes panic when using swiotlb

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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