sh: split coherent pages
Split pages returned by dma_alloc_coherent() and make sure
we free them one by one.
Signed-off-by: Magnus Damm <damm@igel.co.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/arch/sh/mm/consistent.c b/arch/sh/mm/consistent.c
index 9f8ea3a..edcd5fb 100644
--- a/arch/sh/mm/consistent.c
+++ b/arch/sh/mm/consistent.c
@@ -42,6 +42,8 @@
return NULL;
}
+ split_page(pfn_to_page(virt_to_phys(ret) >> PAGE_SHIFT), order);
+
*dma_handle = virt_to_phys(ret);
return ret_nocache;
}
@@ -51,10 +53,13 @@
void *vaddr, dma_addr_t dma_handle)
{
int order = get_order(size);
+ unsigned long pfn = dma_handle >> PAGE_SHIFT;
+ int k;
if (!dma_release_from_coherent(dev, order, vaddr)) {
WARN_ON(irqs_disabled()); /* for portability */
- free_pages((unsigned long)phys_to_virt(dma_handle), order);
+ for (k = 0; k < (1 << order); k++)
+ __free_pages(pfn_to_page(pfn + k), 0);
iounmap(vaddr);
}
}