On Tue, Jul 08, 2003 at 09:34:27PM +0200, Andi Kleen wrote:
> Overflow is typically deadly because the API does not allow proper
> error handling and most drivers don't check for it. That's especially
> risky for block devices: while pci_map_sg can at least return an error
> not everybody checks for it and when you get an overflow the next
> super block write with such an unchecked error will destroy the file
> system.
Personally, I've always thought we were kidding ourselves by not doing
the error checking you describe. From my somewhat-narrow perspective of
network drivers and the libata storage driver, you have to deal with
atomic allocations _anyway_ ... so why not make sure IOMMU overflow
properly fails at the pci_map_foo level?
Jeff
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This archive was generated by hypermail 2b29 : Tue Jul 15 2003 - 22:00:28 EST