1 files changed, 15 insertions, 1 deletions

diff --git a/include/sound/memalloc.h b/include/sound/memalloc.h
index 6a3e7558a7e6..7ccce94a5255 100644
--- a/include/sound/memalloc.h
+++ b/include/sound/memalloc.h
@@ -63,6 +63,11 @@ struct snd_dma_buffer {
 /*
  * Scatter-Gather generic device pages
  */
+void *snd_malloc_sgbuf_pages(struct device *device,
+                             size_t size, struct snd_dma_buffer *dmab,
+                             size_t *res_size);
+int snd_free_sgbuf_pages(struct snd_dma_buffer *dmab);
+
 struct snd_sg_page {
         void *buf;
         dma_addr_t addr;
@@ -90,9 +95,18 @@ static inline unsigned int snd_sgbuf_aligned_pages(size_t size)
  */
 static inline dma_addr_t snd_sgbuf_get_addr(struct snd_sg_buf *sgbuf, size_t offset)
 {
-        return sgbuf->table[offset >> PAGE_SHIFT].addr + offset % PAGE_SIZE;
+        dma_addr_t addr = sgbuf->table[offset >> PAGE_SHIFT].addr;
+        addr &= PAGE_MASK;
+        return addr + offset % PAGE_SIZE;
 }
 
+/*
+ * return the virtual address at the corresponding offset
+ */
+static inline void *snd_sgbuf_get_ptr(struct snd_sg_buf *sgbuf, size_t offset)
+{
+        return sgbuf->table[offset >> PAGE_SHIFT].buf + offset % PAGE_SIZE;
+}
 
 /* allocate/release a buffer */
 int snd_dma_alloc_pages(int type, struct device *dev, size_t size,