[PATCH 1/2] ASoC: mediatek: mt8192: Release reserved memory on cleanup

[Cássio Gabriel]

The MT8192 AFE probe calls of_reserved_mem_device_init() and falls
back to preallocated buffers when no reserved memory region is
available. When the reserved memory assignment succeeds, however, the
driver never releases it.

Register a devm cleanup action after a successful reserved-memory
assignment so the assignment is released on probe failure and driver
unbind.

Fixes: ec4a10ca4a68 ("ASoC: mediatek: use reserved memory or enable buffer pre-allocation")
Cc: stable at vger.kernel.org
Signed-off-by: Cássio Gabriel <cassiogabrielcontato at gmail.com>
---
 sound/soc/mediatek/mt8192/mt8192-afe-pcm.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/sound/soc/mediatek/mt8192/mt8192-afe-pcm.c b/sound/soc/mediatek/mt8192/mt8192-afe-pcm.c
index 3d32fe46118e..9f5057eeeff9 100644
--- a/sound/soc/mediatek/mt8192/mt8192-afe-pcm.c
+++ b/sound/soc/mediatek/mt8192/mt8192-afe-pcm.c
@@ -2155,6 +2155,11 @@ static const dai_register_cb dai_register_cbs[] = {
 	mt8192_dai_memif_register,
 };
 
+static void mt8192_afe_release_reserved_mem(void *data)
+{
+	of_reserved_mem_device_release(data);
+}
+
 static int mt8192_afe_pcm_dev_probe(struct platform_device *pdev)
 {
 	struct mtk_base_afe *afe;
@@ -2184,6 +2189,10 @@ static int mt8192_afe_pcm_dev_probe(struct platform_device *pdev)
 	if (ret) {
 		dev_info(dev, "no reserved memory found, pre-allocating buffers instead\n");
 		afe->preallocate_buffers = true;
+	} else {
+		ret = devm_add_action_or_reset(dev, mt8192_afe_release_reserved_mem, dev);
+		if (ret)
+			return ret;
 	}
 
 	/* init audio related clock */

-- 
2.54.0