Re: kernel BUG at drivers/net/wireless/iwlwifi/iwl3945-base.c:3127!

[Abhijeet Kolekar <abhijeet.kolekar@intel.com>]

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Can you try this patch?

Thanks
Abhijeet

On Thu, 2009-03-19 at 18:22 -0700, Jason Andryuk wrote:

> There is a bug related to the use of DMA.  Using wireless-testing
> 2.6.29-rc7 from ~3/15, and booting with "iommu=off mem=2G" gives me a
> working iwl3945.  I also confirmed
> 78bb4a96d0d4ab2860df5f0fdfde58cd7a3ad642 "iwl3945: use iwl3945_tx_cmd
> instead of iwl_tx_cmd" plus previously posted "rb_stts and BUG to
> WARN" patch as working when iommu is disabled.
> 
> So swiotlb exposes iwl3945 dma breakage.
> 
> From 78bb4a96d0d4ab2860df5f0fdfde58cd7a3ad642 "iwl3945: use
> iwl3945_tx_cmd instead of iwl_tx_cmd" the most obvious problem is the
> change to pci_map_single from pci_alloc_consistent.
> 
> As previously noted, problems brought along by that include the
> modification of data to be DMAed after the _map_single call.  The lack
> of associated un-mapping of memory may also be a problem.
> 
> For testing, swiotlb use can be forced with "swiotlb=force" which
> should reproduce the error.
> 
> Jason
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