drm: radeon: Fix ring_rptr accesses.
The memory behind ring_rptr can either be in ioremapped memory or a vmalloc() normal kernel memory buffer. However, the code unconditionally uses DRM_{READ,WRITE}32() (and thus readl() and writel()) to access it. Basically, if RADEON_IS_AGP then it's ioremap()'d memory else it's vmalloc'd memory. Adjust all of the ring_rptr access code as needed. While we're here, kill the 'scratch' pointer in drm_radeon_private. It's only used in the one place where it is initialized. Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Dave Airlie <airlied@linux.ie>
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