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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>
This commit is contained in:
Takashi Iwai 2009-10-01 07:46:33 +02:00
parent 5da5b6f9e9
commit 18c4078489
2 changed files with 21 additions and 0 deletions
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9
sound/aoa/codecs/tas.c
View File

@ -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.

12
sound/ppc/keywest.c
View File

@ -59,6 +59,18 @@ 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;
/*
* 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 (!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.