linux-kernel - Regression: ASoC: soc-core: clear platform pointers on error

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Message-ID: <bbc0d37a-5a08-9ce0-58b6-c89d28c558ce@nvidia.com>
Date:   Fri, 1 Mar 2019 12:07:02 +0000
From:   Jon Hunter <jonathanh@...dia.com>
To:     Mark Brown <broonie@...nel.org>,
        Curtis Malainey <cujomalainey@...omium.org>,
        linux-tegra <linux-tegra@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "alsa-devel@...a-project.org" <alsa-devel@...a-project.org>
Subject: Regression: ASoC: soc-core: clear platform pointers on error

Hi Mark, Curtis,

I am seeing a regression on -next where the soundcard on one of our
Tegra boards fails to initialise following a probe deferral. The bisect
points to the commit 78a24e10cd94420f1b4e2dc5923ae7109e2aaba1 ('ASoC: 
soc-core: clear platform pointers on error') and reverting this on top
of -next fixes the problem.

Looking at the bootlog from the failure I see ...

 tegra-snd-wm8903 sound: ASoC: failed to init link WM8903

 tegra-snd-wm8903 sound: snd_soc_register_card failed (-517)

 tegra30-i2s 70080400.i2s: DMA channels sourced from device 70080000.ahub

 tegra-snd-wm8903 sound: ASoC: Both platform name/of_node are set for WM8903

 tegra-snd-wm8903 sound: ASoC: failed to init link WM8903

 tegra-snd-wm8903 sound: snd_soc_register_card failed (-22)

 tegra-snd-wm8903: probe of sound failed with error -22

With the above change I see soc_cleanup_platform() is ever being called
when the probe is deferred and hence leads to the failure. Note that the
initial failure, "ASoC: failed to init link WM8903" occurs very early
in snd_soc_register_card() when initialising the prelinks. 

The following fixes it, but I have not scrutinised the code to see if
there are other exit points that we need to handle.

diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index 93d316d5bf8e..6f66beb0c3ae 100644
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -2797,6 +2797,7 @@ int snd_soc_register_card(struct snd_soc_card *card)

                ret = soc_init_dai_link(card, link);
                if (ret) {
+                       soc_cleanup_platform(card);
                        dev_err(card->dev, "ASoC: failed to init link %s\n",
                                link->name);
                        mutex_unlock(&client_mutex);

Cheers
Jon

-- 
nvpublic