Commit 721be3be authored by Charles Keepax's avatar Charles Keepax Committed by Mark Brown
Browse files

ASoC: wm_adsp: Detach compressed stream on free 



If someone powers down the DSP core (through routing changes
say) whilst a compressed record is in progress we can end up
using a freed pointer to the buffer object. When a compressed
audio stream is triggered we attach it to a buffer on a physical
DSP. This patch adds a detach of the buffer from the stream when
the stream is freed or when the DSP is powered down which avoids
the situation where we use a buffer when it is no longer valid.

Signed-off-by: default avatarCharles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent edd71350

sound/soc/codecs/wm_adsp.c

+22 −0
Original line number Diff line number Diff line
@@ -273,8 +273,11 @@ struct wm_adsp_buffer { 
	__be32 words_written[2];	/* total words written (64 bit) */

};



struct wm_adsp_compr;



struct wm_adsp_compr_buf {

	struct wm_adsp *dsp;

	struct wm_adsp_compr *compr;



	struct wm_adsp_buffer_region *regions;

	u32 host_buf_ptr;
@@ -2467,10 +2470,26 @@ static int wm_adsp_compr_attach(struct wm_adsp_compr *compr) 
		return -EINVAL;



	compr->buf = compr->dsp->buffer;

	compr->buf->compr = compr;



	return 0;

}



static void wm_adsp_compr_detach(struct wm_adsp_compr *compr)

{

	if (!compr)

		return;



	/* Wake the poll so it can see buffer is no longer attached */

	if (compr->stream)

		snd_compr_fragment_elapsed(compr->stream);



	if (wm_adsp_compr_attached(compr)) {

		compr->buf->compr = NULL;

		compr->buf = NULL;

	}

}



int wm_adsp_compr_open(struct wm_adsp *dsp, struct snd_compr_stream *stream)

{

	struct wm_adsp_compr *compr;
@@ -2524,6 +2543,7 @@ int wm_adsp_compr_free(struct snd_compr_stream *stream) 


	mutex_lock(&dsp->pwr_lock);



	wm_adsp_compr_detach(compr);

	dsp->compr = NULL;



	kfree(compr->raw_buf);
@@ -2820,6 +2840,8 @@ err_buffer: 
static int wm_adsp_buffer_free(struct wm_adsp *dsp)

{

	if (dsp->buffer) {

		wm_adsp_compr_detach(dsp->buffer->compr);



		kfree(dsp->buffer->regions);

		kfree(dsp->buffer);

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