ARM: dma-mapping: use PMD size for section unmap

The dma_contiguous_remap() function clears existing section maps using
the wrong size (PGDIR_SIZE instead of PMD_SIZE).  This is a bug which
does not affect non-LPAE systems, where PGDIR_SIZE and PMD_SIZE are the same.
On LPAE systems, however, this bug causes the kernel to hang at this point.

This fix has been tested on both LPAE and non-LPAE kernel builds.

Signed-off-by: Vitaly Andrianov <vitalya@ti.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>

diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
index 8665fd2..7629392 100644 (file)
--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c
@@ -399,7 +399,7 @@ void __init dma_contiguous_remap(void)
                 * Clear previous low-memory mapping
                 */
                for (addr = __phys_to_virt(start); addr < __phys_to_virt(end);
-                    addr += PGDIR_SIZE)
+                    addr += PMD_SIZE)
                        pmd_clear(pmd_off_k(addr));
 
                iotable_init(&map, 1);