ASoC: core: remove artificial component and DAI name constraint

Current fmt_single_name code limits maximum name of a DAI or component
to 32 bytes. On some systems corresponding device names might be longer
than that (e.g.
17300000.remoteproc:glink-edge:apr:apr-service@8:routing). This will
result in duplicate DAI/component names. Rewrite fmt_single_name() to
remove such length limitations.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/20200827205100.1479331-1-dmitry.baryshkov@linaro.org
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/soc-core.c

@@ -44,8 +44,6 @@
 #define CREATE_TRACE_POINTS
 #include <trace/events/asoc.h>
 
-#define NAME_SIZE	32
-
 static DEFINE_MUTEX(client_mutex);
 static LIST_HEAD(component_list);
 static LIST_HEAD(unbind_card_list);
@@ -2231,13 +2229,14 @@ EXPORT_SYMBOL_GPL(snd_soc_unregister_card);
  */
 static char *fmt_single_name(struct device *dev, int *id)
 {
-	char *found, name[NAME_SIZE];
+	const char *devname = dev_name(dev);
+	char *found, *name;
 	int id1, id2;
 
-	if (dev_name(dev) == NULL)
+	if (devname == NULL)
 		return NULL;
 
-	strlcpy(name, dev_name(dev), NAME_SIZE);
+	name = devm_kstrdup(dev, devname, GFP_KERNEL);
 
 	/* are we a "%s.%d" name (platform and SPI components) */
 	found = strstr(name, dev->driver->name);
@@ -2250,23 +2249,21 @@ static char *fmt_single_name(struct device *dev, int *id)
 				found[strlen(dev->driver->name)] = '\0';
 		}
 
-	} else {
 	/* I2C component devices are named "bus-addr" */
-		if (sscanf(name, "%x-%x", &id1, &id2) == 2) {
-			char tmp[NAME_SIZE];
+	} else if (sscanf(name, "%x-%x", &id1, &id2) == 2) {
 
 		/* create unique ID number from I2C addr and bus */
 		*id = ((id1 & 0xffff) << 16) + id2;
 
+		devm_kfree(dev, name);
+
 		/* sanitize component name for DAI link creation */
-			snprintf(tmp, NAME_SIZE, "%s.%s", dev->driver->name,
-				 name);
-			strlcpy(name, tmp, NAME_SIZE);
-		} else
+		name = devm_kasprintf(dev, GFP_KERNEL, "%s.%s", dev->driver->name, devname);
+	} else {
 		*id = 0;
 	}
 
-	return devm_kstrdup(dev, name, GFP_KERNEL);
+	return name;
 }
 
 /*