ALSA: Don't assume i2c device probing always succeeds

The client->driver pointer can be NULL when i2c-device probing fails
in i2c_new_device().  This patch adds the NULL checks for client->driver
and return the error instead of blind assumption of driver availability.

Reported-by: Tim Shepard <shep@alum.mit.edu>
Cc: Jean Delvare <khali@linux-fr.org>
Cc: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 9 insertions, 0 deletions

diff --git a/sound/aoa/codecs/tas.c b/sound/aoa/codecs/tas.c
index f0ebc971c686..1dd66ddffcaf 100644
--- a/sound/aoa/codecs/tas.c
+++ b/sound/aoa/codecs/tas.c
@@ -897,6 +897,15 @@ static int tas_create(struct i2c_adapter *adapter,
         client = i2c_new_device(adapter, &info);
         if (!client)
                 return -ENODEV;
+        /*
+         * We know the driver is already loaded, so the device should be
+         * already bound. If not it means binding failed, and then there
+         * is no point in keeping the device instantiated.
+         */
+        if (!client->driver) {
+                i2c_unregister_device(client);
+                return -ENODEV;
+        }
 
         /*
          * Let i2c-core delete that device on driver removal.