Can't get rid of sparse warning

[Jay Cliburn <jacliburn@xxxxxxxxxxxxx>]

I'm getting the following warning from sparse on the line marked /* L523 */ down 
below.  This is from an x86_64 installation of 2.6.19.rc6.  I've included the 
relevant structs for reference.

I'd like to get the code fixed so sparse runs warning-free, but I'm having 
trouble understanding just what the warning tells me.  (This is my first time 
using sparse.)  Can you help by explaining it?  Thanks.

Here's the sparse error:

drivers/net/atl1/atl1_main.c:523:25: warning: incorrect type in assignment 
(different base types)
drivers/net/atl1/atl1_main.c:523:25:    expected unsigned long long [unsigned] 
[usertype] buffer_addr
drivers/net/atl1/atl1_main.c:523:25:    got restricted unsigned long long 
[usertype] [force] <noident>
***********************************************

Here's the source code:
/* .h snippet */
typedef struct rx_free_desc {
	u64 buffer_addr;
	u16 buf_len;
	u16 coalese;
} _AT_ATTRIB_PACK_ rx_free_desc_t;

struct at_buffer {
	struct sk_buff *skb;
	u16 length;
	u16 alloced;
	dma_addr_t dma;  /*dma_addr_t is u64 on my system*/
};

/* .c snippet */
	struct at_buffer *buffer_info;
	rx_free_desc_t *rfd_desc;

And this is the line that generates the sparse warning:
/* L523 */ rfd_desc->buffer_addr = cpu_to_le64(buffer_info->dma);

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