linux-kernel - [PATCH v2] TDA1997x: fix tda1997x

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Message-ID: <m3tukc9tiw.fsf@t19.piap.pl>
Date:   Fri, 30 Jul 2021 08:59:19 +0200
From:   Krzysztof Hałasa <khalasa@...p.pl>
To:     Tim Harvey <tharvey@...eworks.com>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2] TDA1997x: fix tda1997x_remove()

TDA1997x driver tried to hold two values in a single variable:
device's "client data" pointer was first set to "sd" in
v4l2_i2c_subdev_init(), then it was overwritten explicitly
using dev_set_drvdata() with "state". This caused
tda1997x_remove() to fail badly.

Signed-off-by: Krzysztof Hałasa <khalasa@...p.pl>

diff --git a/drivers/media/i2c/tda1997x.c b/drivers/media/i2c/tda1997x.c
index 17be95c0dcb3..fb37918b7fb5 100644
--- a/drivers/media/i2c/tda1997x.c
+++ b/drivers/media/i2c/tda1997x.c
@@ -2490,7 +2490,8 @@ static const struct media_entity_operations tda1997x_media_ops = {
 static int tda1997x_pcm_startup(struct snd_pcm_substream *substream,
 				struct snd_soc_dai *dai)
 {
-	struct tda1997x_state *state = snd_soc_dai_get_drvdata(dai);
+	struct v4l2_subdev *sd = snd_soc_dai_get_drvdata(dai);
+	struct tda1997x_state *state = to_state(sd);
 	struct snd_soc_component *component = dai->component;
 	struct snd_pcm_runtime *rtd = substream->runtime;
 	int rate, err;
@@ -2799,7 +2800,6 @@ static int tda1997x_probe(struct i2c_client *client,
 			dev_err(&client->dev, "register audio codec failed\n");
 			goto err_free_media;
 		}
-		dev_set_drvdata(&state->client->dev, state);
 		v4l_info(state->client, "registered audio codec\n");
 	}
 

-- 
Krzysztof "Chris" Hałasa

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