ASoC: snd_soc_new_{mixer,mux,pga} make sure to use right DAPM context

commit 4b80b8c2eee5282dab57f094fd3893c0c09f750c upstream.

Currently it is possible that snd_soc_new_{mixer,mux,pga} is called with a
DAPM context not matching the widgets context. This can lead to a wrong
prefix_len calculation, which will result in undefined behaviour. To avoid
this always use the DAPM context from the widget itself.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Acked-by: Liam Girdwood <lrg@ti.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c
index 81c4052c127ccc150a63ca50780ddcc9357f25f7..586d10b57b758852adc9ac87bfbc682f9793af7b 100644 (file)
--- a/sound/soc/soc-dapm.c
+++ b/sound/soc/soc-dapm.c
@@ -362,9 +362,9 @@ static int dapm_update_bits(struct snd_soc_dapm_widget *widget)
 }
 
 /* create new dapm mixer control */
-static int dapm_new_mixer(struct snd_soc_dapm_context *dapm,
-       struct snd_soc_dapm_widget *w)
+static int dapm_new_mixer(struct snd_soc_dapm_widget *w)
 {
+       struct snd_soc_dapm_context *dapm = w->dapm;
        int i, ret = 0;
        size_t name_len, prefix_len;
        struct snd_soc_dapm_path *path;
@@ -443,9 +443,9 @@ static int dapm_new_mixer(struct snd_soc_dapm_context *dapm,
 }
 
 /* create new dapm mux control */
-static int dapm_new_mux(struct snd_soc_dapm_context *dapm,
-       struct snd_soc_dapm_widget *w)
+static int dapm_new_mux(struct snd_soc_dapm_widget *w)
 {
+       struct snd_soc_dapm_context *dapm = w->dapm;
        struct snd_soc_dapm_path *path = NULL;
        struct snd_kcontrol *kcontrol;
        struct snd_card *card = dapm->card->snd_card;
@@ -490,8 +490,7 @@ err:
 }
 
 /* create new dapm volume control */
-static int dapm_new_pga(struct snd_soc_dapm_context *dapm,
-       struct snd_soc_dapm_widget *w)
+static int dapm_new_pga(struct snd_soc_dapm_widget *w)
 {
        if (w->num_kcontrols)
                dev_err(w->dapm->dev,
@@ -1735,13 +1734,13 @@ int snd_soc_dapm_new_widgets(struct snd_soc_dapm_context *dapm)
                case snd_soc_dapm_mixer:
                case snd_soc_dapm_mixer_named_ctl:
                        w->power_check = dapm_generic_check_power;
-                       dapm_new_mixer(dapm, w);
+                       dapm_new_mixer(w);
                        break;
                case snd_soc_dapm_mux:
                case snd_soc_dapm_virt_mux:
                case snd_soc_dapm_value_mux:
                        w->power_check = dapm_generic_check_power;
-                       dapm_new_mux(dapm, w);
+                       dapm_new_mux(w);
                        break;
                case snd_soc_dapm_adc:
                case snd_soc_dapm_aif_out:
@@ -1754,7 +1753,7 @@ int snd_soc_dapm_new_widgets(struct snd_soc_dapm_context *dapm)
                case snd_soc_dapm_pga:
                case snd_soc_dapm_out_drv:
                        w->power_check = dapm_generic_check_power;
-                       dapm_new_pga(dapm, w);
+                       dapm_new_pga(w);
                        break;
                case snd_soc_dapm_input:
                case snd_soc_dapm_output: