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[v3,2/5] ALSA: compress: make use of runtime buffer for copy

Message ID 20181115181324.26784-3-srinivas.kandagatla@linaro.org
State Accepted
Commit d00f749b00f7802bf944688ad2971455f84fdacb
Headers show
Series [v3,1/5] ALSA: soc-compress: add support to snd_compr_set_runtime_buffer() | expand

Commit Message

Srinivas Kandagatla Nov. 15, 2018, 6:13 p.m. UTC 
Default copy function uses kmalloc to allocate buffers, lets check
if the runtime buffers are setup before making this allocations.
This can be useful if the buffers are dma buffers.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>

---
 sound/core/compress_offload.c | 18 +++++++++++++++---
 1 file changed, 15 insertions(+), 3 deletions(-)

-- 
2.19.1
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Patch

diff --git a/sound/core/compress_offload.c b/sound/core/compress_offload.c
index 26b5e245b074..a5b09e75e787 100644
--- a/sound/core/compress_offload.c
+++ b/sound/core/compress_offload.c
@@ -171,7 +171,8 @@  static int snd_compr_free(struct inode *inode, struct file *f)
 	}
 
 	data->stream.ops->free(&data->stream);
-	kfree(data->stream.runtime->buffer);
+	if (!data->stream.runtime->dma_buffer_p)
+		kfree(data->stream.runtime->buffer);
 	kfree(data->stream.runtime);
 	kfree(data);
 	return 0;
@@ -505,7 +506,7 @@  static int snd_compr_allocate_buffer(struct snd_compr_stream *stream,
 		struct snd_compr_params *params)
 {
 	unsigned int buffer_size;
-	void *buffer;
+	void *buffer = NULL;
 
 	buffer_size = params->buffer.fragment_size * params->buffer.fragments;
 	if (stream->ops->copy) {
@@ -514,7 +515,18 @@  static int snd_compr_allocate_buffer(struct snd_compr_stream *stream,
 		 * the data from core
 		 */
 	} else {
-		buffer = kmalloc(buffer_size, GFP_KERNEL);
+		if (stream->runtime->dma_buffer_p) {
+
+			if (buffer_size > stream->runtime->dma_buffer_p->bytes)
+				dev_err(&stream->device->dev,
+						"Not enough DMA buffer");
+			else
+				buffer = stream->runtime->dma_buffer_p->area;
+
+		} else {
+			buffer = kmalloc(buffer_size, GFP_KERNEL);
+		}
+
 		if (!buffer)
 			return -ENOMEM;
 	}