linux-kernel - [PATCH 3.18 32/68] ALSA: ppc/awacs: shut up maybe-uninitialized warning

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Date:   Fri,  5 May 2017 11:32:17 -0700
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
        Takashi Iwai <tiwai@...e.de>
Subject: [PATCH 3.18 32/68] ALSA: ppc/awacs: shut up maybe-uninitialized warning

3.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Arnd Bergmann <arnd@...db.de>

commit b268c34e5ee92a4cc3099b0caaf26e6bfbdf0f18 upstream.

The awacs sound driver produces a false-positive warning in ppc64_defconfig:

sound/ppc/awacs.c: In function 'snd_pmac_awacs_init':
include/sound/control.h:219:9: warning: 'master_vol' may be used uninitialized in this function [-Wmaybe-uninitialized]

I haven't come up with a good way to rewrite the code to avoid the
warning, so here is a bad one: I initialize the variable before
the conditionall initialization so gcc no longer has to worry about
it.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
Signed-off-by: Takashi Iwai <tiwai@...e.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 sound/ppc/awacs.c |    1 +
 1 file changed, 1 insertion(+)

--- a/sound/ppc/awacs.c
+++ b/sound/ppc/awacs.c
@@ -991,6 +991,7 @@ snd_pmac_awacs_init(struct snd_pmac *chi
 		if (err < 0)
 			return err;
 	}
+	master_vol = NULL;
 	if (pm7500)
 		err = build_mixers(chip,
 				   ARRAY_SIZE(snd_pmac_awacs_mixers_pmac7500),