On Tue, 31 Aug 2010 13:21:07 -0400
Dave Jones [off-list ref] wrote:

On Tue, Aug 31, 2010 at 11:10:52AM +0200, Simon Kagstrom wrote:
 > On Mon, 30 Aug 2010 21:13:49 -0400
 > Dave Jones [off-list ref] wrote:
 > 
 > > I installed the Fedora 14 alpha, which is based on 2.6.35.2, and hit
 > > the following trace..
 > > 
 > > WARNING: at lib/dma-debug.c:811 check_unmap+0x212/0x59b()
 > > Hardware name:  
 > > via-velocity 0000:00:0e.0: DMA-API: device driver frees DMA memory with different size [device address=0x00000000194ba27e] [map size=66 bytes] [unmap size=182 bytes]
 > 
 > I can't reproduce it here, but does the patch below help for you?

It's looking good so far.  It's been up 30 minutes and hasn't triggered yet
(normally it triggers very shortly after bootup)

Sounds good. I'll think a bit more about this and submit the patch
after that.

I'm not really an expert on the subject, but with skb_headlen(), the size
should be the same for pci_map_single and pci_unmap_single as far as I
can tell.

// Simon