From a342d215c206d955fea55d778e3803b29ee41b60 Mon Sep 17 00:00:00 2001 From: Ben Dooks Date: Thu, 15 Jan 2009 13:50:45 -0800 Subject: gpio: fix probe() error return in gpio driver probes A number of drivers in drivers/gpio return -ENODEV when confronted with missing setup parameters such as the platform data. However, returning -ENODEV causes the driver layer to silently ignore the driver as it assumes the probe did not find anything and was only speculative. To make life easier to discern why a driver is not being attached, change to returning -EINVAL, which is a better description of the fact that the driver data was not valid. Also add a set of dev_dbg() statements to the error paths to provide an better explanation of the error as there may be more that one point in the driver. Signed-off-by: Ben Dooks Cc: David Brownell Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/gpio/max732x.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) (limited to 'drivers/gpio/max732x.c') diff --git a/drivers/gpio/max732x.c b/drivers/gpio/max732x.c index 55ae9a4..f786824 100644 --- a/drivers/gpio/max732x.c +++ b/drivers/gpio/max732x.c @@ -267,8 +267,10 @@ static int __devinit max732x_probe(struct i2c_client *client, int ret, nr_port; pdata = client->dev.platform_data; - if (pdata == NULL) - return -ENODEV; + if (pdata == NULL) { + dev_dbg(&client->dev, "no platform data\n"); + return -EINVAL; + } chip = kzalloc(sizeof(struct max732x_chip), GFP_KERNEL); if (chip == NULL) -- cgit v1.1