Add dma_zalloc_coherent to fix build with kernels older than 3.2

Signed-off-by: Nikolay Martynov <mar.kolya@gmail.com>
Signed-off-by: Luis R. Rodriguez <mcgrof@frijolero.org>

diff --git a/include/linux/compat-3.2.h b/include/linux/compat-3.2.h
index fb9ef68..a17c4ad 100644 (file)
--- a/include/linux/compat-3.2.h
+++ b/include/linux/compat-3.2.h
@@ -64,6 +64,15 @@ static inline char *hex_byte_pack(char *buf, u8 byte)
         module_driver(__platform_driver, platform_driver_register, \
                         platform_driver_unregister)
 
+static inline void *dma_zalloc_coherent(struct device *dev, size_t size,
+                                       dma_addr_t *dma_handle, gfp_t flag)
+{
+       void *ret = dma_alloc_coherent(dev, size, dma_handle, flag);
+       if (ret)
+               memset(ret, 0, size);
+       return ret;
+}
+
 #endif /* (LINUX_VERSION_CODE < KERNEL_VERSION(3,2,0)) */
 
 #endif /* LINUX_3_2_COMPAT_H */