kernel panic while doing dma_alloc_coherent() function

[Valdis.Kletnieks at vt.edu]

On Mon, 22 Jul 2013 17:14:48 +0530, sandeep kumar said:

> While porting the SD card controller driver, i am seeing a kernel panic.
> While tracing with printk, i am struck at
>
> in arch/arm/mm/dma_mapping.c ,
> Function,
>
> static struct page *__dma_alloc_buffer(struct device *dev, size_t size, gfp_t gfp)
> {
>       <snip>
> .....
>     ptr = page_address(page);
>     memset(ptr, 0, size);
>     dmac_flush_range(ptr, ptr + size); --> struck here

Convince us that the values of page, ptr, and size are correct at this
point in the code.  And if you can't, fix them so they *are* correct.
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