ARM: dma-mapping: fix coherent arch dma_alloc_coherent()

The coherent architecture dma_alloc_coherent was using kmalloc/kfree to
manage the memory.  dma_alloc_coherent() is expected to work with a
granularity of a page, so this is wrong.  Fix it by using the helper
functions now provided.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Acked-by: Greg Ungerer <gerg@uclinux.org>

1 files changed, 10 insertions, 8 deletions

diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
index dab2d7f04adf..a67130873431 100644
--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c
@@ -246,14 +246,16 @@ dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gf
                 return memory;
 
         if (arch_is_coherent()) {
-                void *virt;
+                struct page *page;
 
-                virt = kmalloc(size, gfp);
-                if (!virt)
+                page = __dma_alloc_buffer(dev, PAGE_ALIGN(size), gfp);
+                if (!page) {
+                        *handle = ~0;
                         return NULL;
-                *handle =  virt_to_dma(dev, virt);
+                }
 
-                return virt;
+                *handle = page_to_dma(dev, page);
+                return page_address(page);
         }
 
         return __dma_alloc(dev, size, handle, gfp,
@@ -336,13 +338,13 @@ void dma_free_coherent(struct device *dev, size_t size, void *cpu_addr, dma_addr
         if (dma_release_from_coherent(dev, get_order(size), cpu_addr))
                 return;
 
+        size = PAGE_ALIGN(size);
+
         if (arch_is_coherent()) {
-                kfree(cpu_addr);
+                __dma_free_buffer(dma_to_page(dev, handle), size);
                 return;
         }
 
-        size = PAGE_ALIGN(size);
-
         c = arm_vmregion_find_remove(&consistent_head, (unsigned long)cpu_addr);
         if (!c)
                 goto no_area;