ALSA: Warn when control names are truncated

This is likely to confuse user interfaces since the end of the control
name is interpreted (eg, "Volume", "Switch").

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 6 insertions, 1 deletions

diff --git a/sound/core/control.c b/sound/core/control.c
index 6d71f9a7ccbb..b0bf42691047 100644
--- a/sound/core/control.c
+++ b/sound/core/control.c
@@ -225,8 +225,13 @@ struct snd_kcontrol *snd_ctl_new1(const struct snd_kcontrol_new *ncontrol,
         kctl.id.iface = ncontrol->iface;
         kctl.id.device = ncontrol->device;
         kctl.id.subdevice = ncontrol->subdevice;
-        if (ncontrol->name)
+        if (ncontrol->name) {
                 strlcpy(kctl.id.name, ncontrol->name, sizeof(kctl.id.name));
+                if (strcmp(ncontrol->name, kctl.id.name) != 0)
+                        snd_printk(KERN_WARNING
+                                   "Control name '%s' truncated to '%s'\n",
+                                   ncontrol->name, kctl.id.name);
+        }
         kctl.id.index = ncontrol->index;
         kctl.count = ncontrol->count ? ncontrol->count : 1;
         access = ncontrol->access == 0 ? SNDRV_CTL_ELEM_ACCESS_READWRITE :