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authorTakashi Iwai <tiwai@suse.de>2009-10-01 09:46:33 +0400
committerTakashi Iwai <tiwai@suse.de>2009-10-01 09:46:33 +0400
commit18c4078489fe064cc0ed08be3381cf2f26657f5f (patch)
tree72d5534c800da85393209a39d335af2d5606c695 /sound/ppc/keywest.c
parent5da5b6f9e967e8c62486444f97e66252c3768d7d (diff)
downloadlinux-18c4078489fe064cc0ed08be3381cf2f26657f5f.tar.xz
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/keywest.c')
-rw-r--r--sound/ppc/keywest.c12
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.