linux-kernel - Re: [PATCH cciss: fix printk format warning

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Date:	Thu, 26 Oct 2006 16:53:30 -0700
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Roland Dreier <rdreier@...co.com>
CC:	Andrew Morton <akpm@...l.org>, iss_storagedev@...com,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH cciss: fix printk format warning

Roland Dreier wrote:
>  > OK, how about this one then?
>  > 
>  > 	c->busaddr = (__u32) cmd_dma_handle;
>  > 
>  > where cmd_dma_handle is a dma_addr_t (u32 or u64)
> 
> It's super-fishy looking but actually I think it's OK, at least as
> things stand now.  As you see later from how it's freed:
> 
>  > 		pci_free_consistent(h->pdev, sizeof(CommandList_struct),
>  > 				    c, (dma_addr_t) c->busaddr);
> 
> this is the bus address of memory from pci_alloc_consistent(), and
> since cciss never does pci_set_consistent_dma_mask(), the mask will
> remain at the default 32 bits.  So the driver is actually safe in
> assuming that cmd_dma_handle fits into 32 bits.  assuming that
> cmd_dma_handle.

Hm, OK.  Thanks.

-- 
~Randy
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