Yes, indeed I prefer NULL check because the user can know the error
at the right place.  I share your concern about the code addition,
though :)

I already made a patch below, but it's totally untested.
It'd be helpful if someone can do review and build-test it.


thanks,

Takashi

---

diff --git a/sound/aoa/codecs/tas.c b/sound/aoa/codecs/tas.c
index f0ebc97..0f810c8 100644
--- a/sound/aoa/codecs/tas.c
+++ b/sound/aoa/codecs/tas.c

@@ -897,6 +897,10 @@ static int tas_create(struct i2c_adapter *adapter,
 	client = i2c_new_device(adapter, &info);
 	if (!client)
 		return -ENODEV;
+	if (!client->driver) {
+		i2c_unregister_device(client);
+		return -ENODEV;
+	}
 
 	/*
 	 * Let i2c-core delete that device on driver removal.

diff --git a/sound/ppc/keywest.c b/sound/ppc/keywest.c
index 835fa19..473c5a6 100644
--- a/sound/ppc/keywest.c
+++ b/sound/ppc/keywest.c

@@ -59,6 +59,13 @@ static int keywest_attach_adapter(struct i2c_adapter *adapter)
 	strlcpy(info.type, "keywest", I2C_NAME_SIZE);
 	info.addr = keywest_ctx->addr;
 	keywest_ctx->client = i2c_new_device(adapter, &info);
+	if (!keywest_ctx->client)
+		return -ENODEV;
+	if (!keywest_ctx->client->driver) {
+		i2c_unregister_device(keywest_ctx->client);
+		keywest_ctx->client = NULL;
+		return -ENODEV;
+	}
 	
 	/*
 	 * Let i2c-core delete that device on driver removal.