linux-kernel - [PATCH AUTOSEL 5.4 03/14] ASoC: da7219: Check for failure reading AAD IRQ events

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Message-Id: <20230813161202.1086004-3-sashal@kernel.org>
Date:   Sun, 13 Aug 2023 12:11:51 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Dmytro Maluka <dmy@...ihalf.com>, Mark Brown <broonie@...nel.org>,
        Sasha Levin <sashal@...nel.org>,
        support.opensource@...semi.com, lgirdwood@...il.com,
        perex@...ex.cz, tiwai@...e.com, alsa-devel@...a-project.org
Subject: [PATCH AUTOSEL 5.4 03/14] ASoC: da7219: Check for failure reading AAD IRQ events

From: Dmytro Maluka <dmy@...ihalf.com>

[ Upstream commit f0691dc16206f21b13c464434366e2cd632b8ed7 ]

When handling an AAD interrupt, if IRQ events read failed (for example,
due to i2c "Transfer while suspended" failure, i.e. when attempting to
read it while DA7219 is suspended, which may happen due to a spurious
AAD interrupt), the events array contains garbage uninitialized values.
So instead of trying to interprete those values and doing any actions
based on them (potentially resulting in misbehavior, e.g. reporting
bogus events), refuse to handle the interrupt.

Signed-off-by: Dmytro Maluka <dmy@...ihalf.com>
Link: https://lore.kernel.org/r/20230717193737.161784-3-dmy@semihalf.com
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 sound/soc/codecs/da7219-aad.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/sound/soc/codecs/da7219-aad.c b/sound/soc/codecs/da7219-aad.c
index a652f154d8e52..befe26749bc2b 100644
--- a/sound/soc/codecs/da7219-aad.c
+++ b/sound/soc/codecs/da7219-aad.c
@@ -347,11 +347,15 @@ static irqreturn_t da7219_aad_irq_thread(int irq, void *data)
 	struct da7219_priv *da7219 = snd_soc_component_get_drvdata(component);
 	u8 events[DA7219_AAD_IRQ_REG_MAX];
 	u8 statusa;
-	int i, report = 0, mask = 0;
+	int i, ret, report = 0, mask = 0;
 
 	/* Read current IRQ events */
-	regmap_bulk_read(da7219->regmap, DA7219_ACCDET_IRQ_EVENT_A,
-			 events, DA7219_AAD_IRQ_REG_MAX);
+	ret = regmap_bulk_read(da7219->regmap, DA7219_ACCDET_IRQ_EVENT_A,
+			       events, DA7219_AAD_IRQ_REG_MAX);
+	if (ret) {
+		dev_warn_ratelimited(component->dev, "Failed to read IRQ events: %d\n", ret);
+		return IRQ_NONE;
+	}
 
 	if (!events[DA7219_AAD_IRQ_REG_A] && !events[DA7219_AAD_IRQ_REG_B])
 		return IRQ_NONE;
-- 
2.40.1