[PATCH v2 2/3] iio: humidity: dht11: Emit error messages for probe failures

["Uwe Kleine-König" <ukleinek@debian.org>]

There are two exit points in the driver's probe function that fail
silently. From a user perspective this is unsatisfactory because the
device is unusable but there is no hint in the kernel log about the
actual problem which makes it unnecessarily hard to fix the problem.

Make use of dev_err_probe() to emit a problem indication which also does
the right thing if requesting the gpio return -EPROBE_DEFER.

Signed-off-by: Uwe Kleine-König <ukleinek@debian.org>
---
Changes since (implicit) v1:

 - Make it actually compile. (It helps quite a lot to have the driver to
   be tested enabled in the config when doing compile tests *sigh*)
 - Fix a typo I added when manually splitting the original patch

 drivers/iio/humidity/dht11.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/iio/humidity/dht11.c b/drivers/iio/humidity/dht11.c
index 891b6bf0b4ca..0db4f7471319 100644
--- a/drivers/iio/humidity/dht11.c
+++ b/drivers/iio/humidity/dht11.c
@@ -293,6 +293,7 @@ static int dht11_probe(struct platform_device *pdev)
 	struct device *dev = &pdev->dev;
 	struct dht11 *dht11;
 	struct iio_dev *iio;
+	int ret;
 
 	iio = devm_iio_device_alloc(dev, sizeof(*dht11));
 	if (!iio)
@@ -302,7 +303,8 @@ static int dht11_probe(struct platform_device *pdev)
 	dht11->dev = dev;
 	dht11->gpiod = devm_gpiod_get(dev, NULL, GPIOD_IN);
 	if (IS_ERR(dht11->gpiod))
-		return PTR_ERR(dht11->gpiod);
+		return dev_err_probe(dev, PTR_ERR(dht11->gpiod),
+				     "Failed to acquire GPIO\n");
 
 	dht11->irq = gpiod_to_irq(dht11->gpiod);
 	if (dht11->irq < 0) {
@@ -323,7 +325,11 @@ static int dht11_probe(struct platform_device *pdev)
 	iio->channels = dht11_chan_spec;
 	iio->num_channels = ARRAY_SIZE(dht11_chan_spec);
 
-	return devm_iio_device_register(dev, iio);
+	ret = devm_iio_device_register(dev, iio);
+	if (ret < 0)
+		return dev_err_probe(dev, ret, "Failed to register iio device\n");
+
+	return 0;
 }
 
 static struct platform_driver dht11_driver = {
-- 
2.36.1