From a342d215c206d955fea55d778e3803b29ee41b60 Mon Sep 17 00:00:00 2001
From: Ben Dooks <ben-linux@fluff.org>
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 <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>
---
 drivers/gpio/max7301.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

(limited to 'drivers/gpio/max7301.c')

diff --git a/drivers/gpio/max7301.c b/drivers/gpio/max7301.c
index 8b24d784db93..3e7f4e06386e 100644
--- a/drivers/gpio/max7301.c
+++ b/drivers/gpio/max7301.c
@@ -217,8 +217,10 @@ static int __devinit max7301_probe(struct spi_device *spi)
 	int i, ret;
 
 	pdata = spi->dev.platform_data;
-	if (!pdata || !pdata->base)
-		return -ENODEV;
+	if (!pdata || !pdata->base) {
+		dev_dbg(&spi->dev, "incorrect or missing platform data\n");
+		return -EINVAL;
+	}
 
 	/*
 	 * bits_per_word cannot be configured in platform data
-- 
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