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ALSA: Don't assume i2c device probing always succeeds

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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 <[email protected]>
Cc: Jean Delvare <[email protected]>
Cc: Johannes Berg <[email protected]>
Signed-off-by: Takashi Iwai <[email protected]>
This commit is contained in:
Takashi Iwai 2009-10-01 07:46:33 +02:00
commit 18c4078489
2 changed files with 21 additions and 0 deletions
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12
sound/ppc/keywest.c
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@ -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.