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Diffstat (limited to 'sound/core/pcm_memory.c')
-rw-r--r--sound/core/pcm_memory.c40
1 files changed, 33 insertions, 7 deletions
diff --git a/sound/core/pcm_memory.c b/sound/core/pcm_memory.c
index ff07b4a9992e..a6d42808828c 100644
--- a/sound/core/pcm_memory.c
+++ b/sound/core/pcm_memory.c
@@ -50,8 +50,6 @@ static int preallocate_pcm_pages(struct snd_pcm_substream *substream, size_t siz
struct snd_dma_buffer *dmab = &substream->dma_buffer;
int err;
- snd_assert(size > 0, return -EINVAL);
-
/* already reserved? */
if (snd_dma_get_reserved_buf(dmab, substream->dma_buf_id) > 0) {
if (dmab->bytes >= size)
@@ -326,6 +324,32 @@ struct page *snd_pcm_sgbuf_ops_page(struct snd_pcm_substream *substream, unsigne
EXPORT_SYMBOL(snd_pcm_sgbuf_ops_page);
+/*
+ * compute the max chunk size with continuous pages on sg-buffer
+ */
+unsigned int snd_pcm_sgbuf_get_chunk_size(struct snd_pcm_substream *substream,
+ unsigned int ofs, unsigned int size)
+{
+ struct snd_sg_buf *sg = snd_pcm_substream_sgbuf(substream);
+ unsigned int start, end, pg;
+
+ start = ofs >> PAGE_SHIFT;
+ end = (ofs + size - 1) >> PAGE_SHIFT;
+ /* check page continuity */
+ pg = sg->table[start].addr >> PAGE_SHIFT;
+ for (;;) {
+ start++;
+ if (start > end)
+ break;
+ pg++;
+ if ((sg->table[start].addr >> PAGE_SHIFT) != pg)
+ return (start << PAGE_SHIFT) - ofs;
+ }
+ /* ok, all on continuous pages */
+ return size;
+}
+EXPORT_SYMBOL(snd_pcm_sgbuf_get_chunk_size);
+
/**
* snd_pcm_lib_malloc_pages - allocate the DMA buffer
* @substream: the substream to allocate the DMA buffer to
@@ -342,10 +366,12 @@ int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size)
struct snd_pcm_runtime *runtime;
struct snd_dma_buffer *dmab = NULL;
- snd_assert(substream->dma_buffer.dev.type != SNDRV_DMA_TYPE_UNKNOWN, return -EINVAL);
- snd_assert(substream != NULL, return -EINVAL);
+ if (PCM_RUNTIME_CHECK(substream))
+ return -EINVAL;
+ if (snd_BUG_ON(substream->dma_buffer.dev.type ==
+ SNDRV_DMA_TYPE_UNKNOWN))
+ return -EINVAL;
runtime = substream->runtime;
- snd_assert(runtime != NULL, return -EINVAL);
if (runtime->dma_buffer_p) {
/* perphaps, we might free the large DMA memory region
@@ -391,9 +417,9 @@ int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime;
- snd_assert(substream != NULL, return -EINVAL);
+ if (PCM_RUNTIME_CHECK(substream))
+ return -EINVAL;
runtime = substream->runtime;
- snd_assert(runtime != NULL, return -EINVAL);
if (runtime->dma_area == NULL)
return 0;
if (runtime->dma_buffer_p != &substream->dma_buffer) {