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authorBen Dooks <ben-linux@fluff.org>2009-01-15 13:50:45 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2009-01-15 16:39:35 -0800
commita342d215c206d955fea55d778e3803b29ee41b60 (patch)
tree36e831878b6ed7e004d5f4e6c667b4053c756f83 /drivers/gpio/pcf857x.c
parent5b96f1729064453e09805a387378e0644da1c937 (diff)
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 <ben-linux@fluff.org> Cc: David Brownell <david-b@pacbell.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/gpio/pcf857x.c')
-rw-r--r--drivers/gpio/pcf857x.c12
1 files changed, 8 insertions, 4 deletions
diff --git a/drivers/gpio/pcf857x.c b/drivers/gpio/pcf857x.c
index 4bc2070dd4a..9525724be73 100644
--- a/drivers/gpio/pcf857x.c
+++ b/drivers/gpio/pcf857x.c
@@ -188,8 +188,10 @@ static int pcf857x_probe(struct i2c_client *client,
int status;
pdata = client->dev.platform_data;
- if (!pdata)
- return -ENODEV;
+ if (!pdata) {
+ dev_dbg(&client->dev, "no platform data\n");
+ return -EINVAL;
+ }
/* Allocate, initialize, and register this gpio_chip. */
gpio = kzalloc(sizeof *gpio, GFP_KERNEL);
@@ -248,8 +250,10 @@ static int pcf857x_probe(struct i2c_client *client,
else
status = i2c_read_le16(client);
- } else
- status = -ENODEV;
+ } else {
+ dev_dbg(&client->dev, "unsupported number of gpios\n");
+ status = -EINVAL;
+ }
if (status < 0)
goto fail;