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| author | Takashi Iwai <tiwai@suse.de> | 2009-10-01 07:46:33 +0200 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2009-10-01 07:46:33 +0200 |
| commit | 18c4078489fe064cc0ed08be3381cf2f26657f5f (patch) | |
| tree | 72d5534c800da85393209a39d335af2d5606c695 /sound/ppc | |
| parent | 5da5b6f9e967e8c62486444f97e66252c3768d7d (diff) | |
| download | lwn-18c4078489fe064cc0ed08be3381cf2f26657f5f.tar.gz lwn-18c4078489fe064cc0ed08be3381cf2f26657f5f.zip | |
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>
Diffstat (limited to 'sound/ppc')
| -rw-r--r-- | sound/ppc/keywest.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/sound/ppc/keywest.c b/sound/ppc/keywest.c index 835fa19ed461..bb6819aab133 100644 --- a/sound/ppc/keywest.c +++ b/sound/ppc/keywest.c @@ -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. |