Re: [PATCH] Fix IOMMU overflow checking in s2io.c

[Jeff Garzik <jeff@garzik.org>]

Andi Kleen wrote:
> Fix IOMMU overflow checking in s2io.c
> 
> s2io has IOMMU overflow checking, but unfortunately it is wrong.
> 
> It didn't use the standard macros, which meant that it only worked
> on POWER and SPARC because only those define DMA_ERROR_CODE. Convert it to 
> use the standard macros instead.
> 
> I also commented two more bugs in the IOMMU handling. It assumes
> that 0 DMA addresses cannot happen, but that's not true in all IOMMU setups.
> The information if a buffer has been already mapped needs to be stored
> elsewhere.
> 
> Didn't fix those because it needs careful checking of the buffer handling
> by the maintainers.
> 
> Cc: ram.vepa@neterion.com
> Cc: santosh.rastapur@neterion.com
> Cc: sivakumar.subramani@neterion.com
> Cc: sreenivasa.honnur@neterion.com
> 
> Signed-off-by: Andi Kleen <ak@linux.intel.com>

applied