[alsa-devel] [PATCH 1/2] Revert "ASoC: hdmi-codec: re-introduce mutex locking"

[Jerome Brunet]

This reverts commit eb1ecadb7f67dde94ef0efd3ddaed5cb6c9a65ed.

This fixes the following warning reported by lockdep and a potential
issue with hibernation

====================================
WARNING: pulseaudio/1297 still has locks held!
5.3.0+ #1826 Not tainted
------------------------------------
1 lock held by pulseaudio/1297:
 #0: ee815308 (&hcp->lock){....}, at: hdmi_codec_startup+0x20/0x130

stack backtrace:
CPU: 0 PID: 1297 Comm: pulseaudio Not tainted 5.3.0+ #1826
Hardware name: Marvell Dove (Cubox)
[<c0017b4c>] (unwind_backtrace) from [<c0014d10>] (show_stack+0x10/0x14)
[<c0014d10>] (show_stack) from [<c00a2d18>] (futex_wait_queue_me+0x13c/0x19c)
[<c00a2d18>] (futex_wait_queue_me) from [<c00a3630>] (futex_wait+0x184/0x24c)
[<c00a3630>] (futex_wait) from [<c00a5e1c>] (do_futex+0x334/0x598)
[<c00a5e1c>] (do_futex) from [<c00a62e8>] (sys_futex_time32+0x118/0x180)
[<c00a62e8>] (sys_futex_time32) from [<c0009000>] (ret_fast_syscall+0x0/0x54)
Exception stack(0xebd31fa8 to 0xebd31ff0)
1fa0:                   00000000 ffffffff 000c8748 00000189 00000001 00000000
1fc0: 00000000 ffffffff 00000000 000000f0 00000000 00000000 00000000 00056200
1fe0: 000000f0 beac03a8 b6d6c835 b6d6f456

Fixes: eb1ecadb7f67 ("ASoC: hdmi-codec: re-introduce mutex locking")
Reported-by: Russell King <rmk+kernel at armlinux.org.uk>
Signed-off-by: Jerome Brunet <jbrunet at baylibre.com>
---
 sound/soc/codecs/hdmi-codec.c | 12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/sound/soc/codecs/hdmi-codec.c b/sound/soc/codecs/hdmi-codec.c
index b5fd8f08726e..f8b5b960e597 100644
--- a/sound/soc/codecs/hdmi-codec.c
+++ b/sound/soc/codecs/hdmi-codec.c
@@ -274,7 +274,7 @@ struct hdmi_codec_priv {
 	uint8_t eld[MAX_ELD_BYTES];
 	struct snd_pcm_chmap *chmap_info;
 	unsigned int chmap_idx;
-	struct mutex lock;
+	unsigned long busy;
 	struct snd_soc_jack *jack;
 	unsigned int jack_status;
 };
@@ -390,8 +390,8 @@ static int hdmi_codec_startup(struct snd_pcm_substream *substream,
 	struct hdmi_codec_priv *hcp = snd_soc_dai_get_drvdata(dai);
 	int ret = 0;
 
-	ret = mutex_trylock(&hcp->lock);
-	if (!ret) {
+	ret = test_and_set_bit(0, &hcp->busy);
+	if (ret) {
 		dev_err(dai->dev, "Only one simultaneous stream supported!\n");
 		return -EINVAL;
 	}
@@ -419,7 +419,7 @@ static int hdmi_codec_startup(struct snd_pcm_substream *substream,
 
 err:
 	/* Release the exclusive lock on error */
-	mutex_unlock(&hcp->lock);
+	clear_bit(0, &hcp->busy);
 	return ret;
 }
 
@@ -431,7 +431,7 @@ static void hdmi_codec_shutdown(struct snd_pcm_substream *substream,
 	hcp->chmap_idx = HDMI_CODEC_CHMAP_IDX_UNKNOWN;
 	hcp->hcd.ops->audio_shutdown(dai->dev->parent, hcp->hcd.data);
 
-	mutex_unlock(&hcp->lock);
+	clear_bit(0, &hcp->busy);
 }
 
 static int hdmi_codec_hw_params(struct snd_pcm_substream *substream,
@@ -811,8 +811,6 @@ static int hdmi_codec_probe(struct platform_device *pdev)
 		return -ENOMEM;
 
 	hcp->hcd = *hcd;
-	mutex_init(&hcp->lock);
-
 	daidrv = devm_kcalloc(dev, dai_count, sizeof(*daidrv), GFP_KERNEL);
 	if (!daidrv)
 		return -ENOMEM;
-- 
2.21.0