linux-kernel - [PATCH] ASoC: amd: acp: Fix possible deadlock

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Message-ID: <20250127083422.20406-1-daniel.baluta@nxp.com>
Date: Mon, 27 Jan 2025 10:34:22 +0200
From: Daniel Baluta <daniel.baluta@....com>
To: broonie@...nel.org
Cc: venkataprasad.potturu@....com,
	Vijendar.Mukunda@....com,
	linux-sound@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Daniel Baluta <daniel.baluta@....com>,
	Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>,
	Pierre-Louis Bossart <pierre-louis.bossart@...ux.dev>,
	Bard Liao <yung-chuan.liao@...ux.intel.com>
Subject: [PATCH] ASoC: amd: acp: Fix possible deadlock

On error path, function acp_i2s_set_tdm_slot returns without releasing
the lock and this could result in potential deadlocks in the future.

Error reported by sparse:
sound/soc/amd/acp/acp-i2s.c:95:12: error: context imbalance in
'acp_i2s_set_tdm_slot' - different lock contexts for basic block

Fixes: cd60dec8994c ("ASoC: amd: acp: Refactor TDM slots selction based on acp revision id")
Signed-off-by: Daniel Baluta <daniel.baluta@....com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@...ux.dev>
Reviewed-by: Bard Liao <yung-chuan.liao@...ux.intel.com>
---
 sound/soc/amd/acp/acp-i2s.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/sound/soc/amd/acp/acp-i2s.c b/sound/soc/amd/acp/acp-i2s.c
index 1f59ee248771..89e99ed4275a 100644
--- a/sound/soc/amd/acp/acp-i2s.c
+++ b/sound/soc/amd/acp/acp-i2s.c
@@ -181,6 +181,7 @@ static int acp_i2s_set_tdm_slot(struct snd_soc_dai *dai, u32 tx_mask, u32 rx_mas
 			break;
 		default:
 			dev_err(dev, "Unknown chip revision %d\n", chip->acp_rev);
+			spin_unlock_irq(&adata->acp_lock);
 			return -EINVAL;
 		}
 	}
-- 
2.43.0