On Fri, 27 Oct 2006 08:11:46 -0500 Cameron, Steve wrote:
> > Roland Dreier wrote:
> > > > > if (*total_size != (__u32) 0)
> > > >
> > > > Why is cciss_read_capacity casting *total_size to u32?
> > >
> > > It's not -- it's actually casting 0 to __32 -- there's no cast on the
> > > *total_size side of the comparison. However that just makes the cast
> > > look even fishier.
> > >
> > > - R.
> >
> > OK, how about this one then?
> >
> >
> > c->busaddr = (__u32) cmd_dma_handle;
> >
> > where cmd_dma_handle is a dma_addr_t (u32 or u64)
>
> The command register to which that value is written
> is a 32 bit register. Cast it or not, only 32 bits
> will be used. The DMA mask used to get that memory
> should ensure it's 32 bit addressable.
Got it. Thanks for replying.
> > and then later:
> >
> > pci_free_consistent(h->pdev, sizeof(CommandList_struct),
> > c, (dma_addr_t) c->busaddr);
---
~Randy
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