linux-kernel - [PATCH 5.19 0921/1157] ASoC: codecs: wsa881x: handle timeouts in resume path

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Message-Id: <20220815180516.295036825@linuxfoundation.org>
Date:   Mon, 15 Aug 2022 20:04:37 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Mark Brown <broonie@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.19 0921/1157] ASoC: codecs: wsa881x: handle timeouts in resume path

From: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>

[ Upstream commit cf6af24b54903f9f70c29b3e5b19cb72cc862d60 ]

Currently we do not check if SoundWire slave initialization timeout
expired before continuing to access its registers.

Its possible that the registers are not accessible if timeout is
expired. Handle this by returning timeout in resume path.

Reported-by: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
Fixes: 8dd552458361 ("ASoC: codecs: wsa881x: add runtime pm support")
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
Link: https://lore.kernel.org/r/20220630130023.9308-1-srinivas.kandagatla@linaro.org
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 sound/soc/codecs/wsa881x.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/sound/soc/codecs/wsa881x.c b/sound/soc/codecs/wsa881x.c
index f3a56f3ce487..02a438c6c4c7 100644
--- a/sound/soc/codecs/wsa881x.c
+++ b/sound/soc/codecs/wsa881x.c
@@ -1175,11 +1175,17 @@ static int __maybe_unused wsa881x_runtime_resume(struct device *dev)
 	struct sdw_slave *slave = dev_to_sdw_dev(dev);
 	struct regmap *regmap = dev_get_regmap(dev, NULL);
 	struct wsa881x_priv *wsa881x = dev_get_drvdata(dev);
+	unsigned long time;
 
 	gpiod_direction_output(wsa881x->sd_n, 1);
 
-	wait_for_completion_timeout(&slave->initialization_complete,
-				    msecs_to_jiffies(WSA881X_PROBE_TIMEOUT));
+	time = wait_for_completion_timeout(&slave->initialization_complete,
+					   msecs_to_jiffies(WSA881X_PROBE_TIMEOUT));
+	if (!time) {
+		dev_err(dev, "Initialization not complete, timed out\n");
+		gpiod_direction_output(wsa881x->sd_n, 0);
+		return -ETIMEDOUT;
+	}
 
 	regcache_cache_only(regmap, false);
 	regcache_sync(regmap);
-- 
2.35.1