ASoC: wm_hubs: Silence reg_r and reg_l 'may be used uninitialized' warnings

Return an error from wm_hubs_read_dc_servo() if hubs->dcs_readback_mode is not
correctly initialized. You might as well bail out since nothing is likely to
work correctly afterwards.

sound/soc/codecs/wm_hubs.c:321:11: warning: 'reg_r' may be used uninitialized in this function [-Wuninitialized]
sound/soc/codecs/wm_hubs.c:251:13: note: 'reg_r' was declared here
sound/soc/codecs/wm_hubs.c:322:11: warning: 'reg_l' may be used uninitialized in this function [-Wuninitialized]
sound/soc/codecs/wm_hubs.c:251:6: note: 'reg_l' was declared here

gcc version 4.6.3

Signed-off-by: Tim Gardner <tim.gardner@canonical.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

diff --git a/sound/soc/codecs/wm_hubs.c b/sound/soc/codecs/wm_hubs.c
index 867ae97..f5d81b9 100644 (file)
--- a/sound/soc/codecs/wm_hubs.c
+++ b/sound/soc/codecs/wm_hubs.c
@@ -199,11 +199,12 @@ static void wm_hubs_dcs_cache_set(struct snd_soc_codec *codec, u16 dcs_cfg)
        list_add_tail(&cache->list, &hubs->dcs_cache);
 }
 
-static void wm_hubs_read_dc_servo(struct snd_soc_codec *codec,
+static int wm_hubs_read_dc_servo(struct snd_soc_codec *codec,
                                  u16 *reg_l, u16 *reg_r)
 {
        struct wm_hubs_data *hubs = snd_soc_codec_get_drvdata(codec);
        u16 dcs_reg, reg;
+       int ret = 0;
 
        switch (hubs->dcs_readback_mode) {
        case 2:
@@ -236,8 +237,9 @@ static void wm_hubs_read_dc_servo(struct snd_soc_codec *codec,
                break;
        default:
                WARN(1, "Unknown DCS readback method\n");
-               return;
+               ret = -1;
        }
+       return ret;
 }
 
 /*
@@ -286,7 +288,8 @@ static void enable_dc_servo(struct snd_soc_codec *codec)
                                  WM8993_DCS_TRIG_STARTUP_1);
        }
 
-       wm_hubs_read_dc_servo(codec, &reg_l, &reg_r);
+       if (wm_hubs_read_dc_servo(codec, &reg_l, &reg_r) < 0)
+               return;
 
        dev_dbg(codec->dev, "DCS input: %x %x\n", reg_l, reg_r);