--- /dev/null
+From f0e8ed858edb327802ee65fd695cc1538286226f Mon Sep 17 00:00:00 2001
+From: Mark Brown <broonie@opensource.wolfsonmicro.com>
+Date: Tue, 20 Sep 2011 11:41:54 +0100
+Subject: ASoC: Ensure we generate a driver name
+
+From: Mark Brown <broonie@opensource.wolfsonmicro.com>
+
+commit f0e8ed858edb327802ee65fd695cc1538286226f upstream.
+
+Commit 873bd4c (ASoC: Don't set invalid name string to snd_card->driver
+field) broke generation of a driver name for all ASoC cards relying on the
+automatic generation of one. Fix this by using the old default with spaces
+replaced by underscores.
+
+Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
+Acked-by: Takashi Iwai <tiwai@suse.de>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+
+---
+ sound/soc/soc-core.c | 18 +++++++++++++++---
+ 1 file changed, 15 insertions(+), 3 deletions(-)
+
+--- a/sound/soc/soc-core.c
++++ b/sound/soc/soc-core.c
+@@ -30,6 +30,7 @@
+ #include <linux/bitops.h>
+ #include <linux/debugfs.h>
+ #include <linux/platform_device.h>
++#include <linux/ctype.h>
+ #include <linux/slab.h>
+ #include <sound/ac97_codec.h>
+ #include <sound/core.h>
+@@ -1931,9 +1932,20 @@ static void snd_soc_instantiate_card(str
+ "%s", card->name);
+ snprintf(card->snd_card->longname, sizeof(card->snd_card->longname),
+ "%s", card->long_name ? card->long_name : card->name);
+- if (card->driver_name)
+- strlcpy(card->snd_card->driver, card->driver_name,
+- sizeof(card->snd_card->driver));
++ snprintf(card->snd_card->driver, sizeof(card->snd_card->driver),
++ "%s", card->driver_name ? card->driver_name : card->name);
++ for (i = 0; i < ARRAY_SIZE(card->snd_card->driver); i++) {
++ switch (card->snd_card->driver[i]) {
++ case '_':
++ case '-':
++ case '\0':
++ break;
++ default:
++ if (!isalnum(card->snd_card->driver[i]))
++ card->snd_card->driver[i] = '_';
++ break;
++ }
++ }
+
+ if (card->late_probe) {
+ ret = card->late_probe(card);