linux-kernel - [PATCH 1/2] ASoC: dapm: add initialization for w_param

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Date:   Tue, 10 Oct 2017 11:20:10 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Mark Brown <broonie@...nel.org>
Cc:     Arnd Bergmann <arnd@...db.de>, Liam Girdwood <lgirdwood@...il.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Charles Keepax <ckeepax@...nsource.cirrus.com>,
        anish kumar <yesanishhere@...il.com>,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] ASoC: dapm: add initialization for w_param_text pointer

We now allocate the array conditionally, but we always pass
the pointer to the new snd_soc_dapm_free_kcontrol() function,
which introduces a warning for the case that it is not
initialized:

sound/soc/soc-dapm.c: In function 'snd_soc_dapm_new_pcm':
sound/soc/soc-dapm.c:3940:2: error: 'w_param_text' may be used uninitialized in this function [-Werror=maybe-uninitialized]

As snd_soc_dapm_free_kcontrol() is global, it doesn't get inlined
and gcc fails to notice that we don't actually access the array
in that case, so the code is actually safe. Adding an initialization
for the array pointer shuts up the warning.

Fixes: 19ad683abc85 ("ASoC: dapm: Avoid creating kcontrol for params")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 sound/soc/soc-dapm.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c
index ceec185c871f..19babdae1a06 100644
--- a/sound/soc/soc-dapm.c
+++ b/sound/soc/soc-dapm.c
@@ -3905,6 +3905,8 @@ int snd_soc_dapm_new_pcm(struct snd_soc_card *card,
 			ret = -ENOMEM;
 			goto param_fail;
 		}
+	} else {
+		w_param_text = NULL;
 	}
 	dev_dbg(card->dev, "ASoC: adding %s widget\n", link_name);
 
-- 
2.9.0