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From:   =?UTF-8?q?Amadeusz=20S=C5=82awi=C5=84ski?= 
        <amadeuszx.slawinski@linux.intel.com>
To:     alsa-devel@alsa-project.org
Cc:     Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.com>,
        Liam Girdwood <lgirdwood@gmail.com>,
        Mark Brown <broonie@kernel.org>,
        Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>,
        Jie Yang <yang.jie@linux.intel.com>,
        Cezary Rojewski <cezary.rojewski@intel.com>,
        linux-kernel@vger.kernel.org,
        =?UTF-8?q?Amadeusz=20S=C5=82awi=C5=84ski?= 
        <amadeuszx.slawinski@linux.intel.com>,
        Bard Liao <bardliao@realtek.com>,
        Oder Chiou <oder_chiou@realtek.com>
Subject: [PATCH 10/14] SoC: rt274: Fix internal jack assignment in set_jack callback
Date:   Wed,  5 Jun 2019 15:45:52 +0200
Message-Id: <20190605134556.10322-11-amadeuszx.slawinski@linux.intel.com>
In-Reply-To: <20190605134556.10322-1-amadeuszx.slawinski@linux.intel.com>
References: <20190605134556.10322-1-amadeuszx.slawinski@linux.intel.com>
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When we call snd_soc_component_set_jack(component, NULL, NULL) we should
set rt274->jack to passed jack, so when interrupt is triggered it calls
snd_soc_jack_report(rt274->jack, ...) with proper value.

This fixes problem in machine where in register, we call
snd_soc_register(component, &headset, NULL), which just calls
rt274_mic_detect via callback.
Now when machine driver is removed "headset" will be gone, so we
need to tell codec driver that it's gone with:
snd_soc_register(component, NULL, NULL), but we also need to be able
to handle NULL jack argument here gracefully.
If we don't set it to NULL, next time the rt274_irq runs it will call
snd_soc_jack_report with first argument being invalid pointer and there
will be Oops.

Signed-off-by: Amadeusz Sławiński <amadeuszx.slawinski@linux.intel.com>
---
 sound/soc/codecs/rt274.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/sound/soc/codecs/rt274.c b/sound/soc/codecs/rt274.c
index adf59039a3b6..cdd312db3e78 100644
--- a/sound/soc/codecs/rt274.c
+++ b/sound/soc/codecs/rt274.c
@@ -405,6 +405,8 @@ static int rt274_mic_detect(struct snd_soc_component *component,
 {
 	struct rt274_priv *rt274 = snd_soc_component_get_drvdata(component);
 
+	rt274->jack = jack;
+
 	if (jack == NULL) {
 		/* Disable jack detection */
 		regmap_update_bits(rt274->regmap, RT274_EAPD_GPIO_IRQ_CTRL,
@@ -412,7 +414,6 @@ static int rt274_mic_detect(struct snd_soc_component *component,
 
 		return 0;
 	}
-	rt274->jack = jack;
 
 	regmap_update_bits(rt274->regmap, RT274_EAPD_GPIO_IRQ_CTRL,
 				RT274_IRQ_EN, RT274_IRQ_EN);
-- 
2.17.1