[PATCH 4/7] mmc: at91_mci: use DMA buffer for read

[Andrew Morton]

On Fri, 26 Feb 2010 19:39:32 +0100
Nicolas Ferre <nicolas.ferre at atmel.com> wrote:

> +		kunmap_atomic(((void *)sgbuffer)-sg->offset, KM_BIO_SRC_IRQ);

It's a feature of kunmap_atomic() that it will accept a pointer to any
location in the page.  So the subtraction isn't strictly needed.

And if the subtraction is removed, the (void*) cast can also be removed.