iio: inkern: only return error codes in iio_channel_get_*() APIs

APIs like of_iio_channel_get_by_name() and of_iio_channel_get_all() were
returning a mix of NULL and pointers with NULL being the way to
"notify" that we should do a "system" lookup for channels. This make
it very confusing and prone to errors as commit 9f63cc0921ec
("iio: inkern: fix return value in devm_of_iio_channel_get_by_name()")
proves. On top of this, patterns like 'if (channel != NULL) return
channel' were being used where channel could actually be an error code
which makes the code hard to read.

This change also makes some functional changes on how errors were being
handled. In the original behavior, even if we get an error like '-ENOMEM',
we still continue with the search. We should only continue to lookup for
the channel when it makes sense to do so. Hence, the main error handling
in 'of_iio_channel_get_by_name()' is changed to the following logic:

 * If a channel 'name' is provided and we do find it via
'io-channel-names', we should be able to get it. If we get any error,
we should not proceed with the lookup. Moreover, we should return an error
so that callers won't proceed with a system lookup.
 * If a channel 'name' is provided and we cannot find it ('index < 0'),
'of_parse_phandle_with_args()' is expected to fail with '-EINVAL'. Hence,
we should only continue if we get that error.
 * If a channel 'name' is not provided we should only carry on with the
search if 'of_parse_phandle_with_args()' returns '-ENOENT'.

Also note that a system channel lookup is only done if the returned
error code (from 'of_iio_channel_get_by_name()' or
'of_iio_channel_get_all()' is -ENODEV.
Signed-off-by: Nuno Sá <nuno.sa@analog.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Link: https://lore.kernel.org/r/20220715122903.332535-4-nuno.sa@analog.comSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/inkern.c

@@ -214,7 +214,7 @@ static struct iio_channel *of_iio_channel_get(struct device_node *np, int index)
 struct iio_channel *of_iio_channel_get_by_name(struct device_node *np,
 					       const char *name)
 {
-	struct iio_channel *chan = NULL;
+	struct iio_channel *chan;
 
 	/* Walk up the tree of devices looking for a matching iio channel */
 	while (np) {
@@ -231,11 +231,33 @@ struct iio_channel *of_iio_channel_get_by_name(struct device_node *np,
 							 name);
 		chan = of_iio_channel_get(np, index);
 		if (!IS_ERR(chan) || PTR_ERR(chan) == -EPROBE_DEFER)
-			break;
-		else if (name && index >= 0) {
-			pr_err("ERROR: could not get IIO channel %pOF:%s(%i)\n",
-				np, name ? name : "", index);
-			return NULL;
+			return chan;
+		if (name) {
+			if (index >= 0) {
+				pr_err("ERROR: could not get IIO channel %pOF:%s(%i)\n",
+				       np, name, index);
+				/*
+				 * In this case, we found 'name' in 'io-channel-names'
+				 * but somehow we still fail so that we should not proceed
+				 * with any other lookup. Hence, explicitly return -EINVAL
+				 * (maybe not the better error code) so that the caller
+				 * won't do a system lookup.
+				 */
+				return ERR_PTR(-EINVAL);
+			}
+			/*
+			 * If index < 0, then of_parse_phandle_with_args() fails
+			 * with -EINVAL which is expected. We should not proceed
+			 * if we get any other error.
+			 */
+			if (PTR_ERR(chan) != -EINVAL)
+				return chan;
+		} else if (PTR_ERR(chan) != -ENOENT) {
+			/*
+			 * if !name, then we should only proceed the lookup if
+			 * of_parse_phandle_with_args() returns -ENOENT.
+			 */
+			return chan;
 		}
 
 		/*
@@ -245,10 +267,10 @@ struct iio_channel *of_iio_channel_get_by_name(struct device_node *np,
 		 */
 		np = np->parent;
 		if (np && !of_get_property(np, "io-channel-ranges", NULL))
-			return NULL;
+			return ERR_PTR(-ENODEV);
 	}
 
-	return chan;
+	return ERR_PTR(-ENODEV);
 }
 EXPORT_SYMBOL_GPL(of_iio_channel_get_by_name);
 
@@ -267,8 +289,8 @@ static struct iio_channel *of_iio_channel_get_all(struct device *dev)
 			break;
 	} while (++nummaps);
 
-	if (nummaps == 0)	/* no error, return NULL to search map table */
-		return NULL;
+	if (nummaps == 0)
+		return ERR_PTR(-ENODEV);
 
 	/* NULL terminated array to save passing size */
 	chans = kcalloc(nummaps + 1, sizeof(*chans), GFP_KERNEL);
@@ -295,7 +317,7 @@ static struct iio_channel *of_iio_channel_get_all(struct device *dev)
 
 static inline struct iio_channel *of_iio_channel_get_all(struct device *dev)
 {
-	return NULL;
+	return ERR_PTR(-ENODEV);
 }
 
 #endif /* CONFIG_OF */
@@ -362,7 +384,7 @@ struct iio_channel *iio_channel_get(struct device *dev,
 	if (dev) {
 		channel = of_iio_channel_get_by_name(dev->of_node,
 						     channel_name);
-		if (channel != NULL)
+		if (!IS_ERR(channel) || PTR_ERR(channel) != -ENODEV)
 			return channel;
 	}
 
@@ -412,8 +434,6 @@ struct iio_channel *devm_of_iio_channel_get_by_name(struct device *dev,
 	channel = of_iio_channel_get_by_name(np, channel_name);
 	if (IS_ERR(channel))
 		return channel;
-	if (!channel)
-		return ERR_PTR(-ENODEV);
 
 	ret = devm_add_action_or_reset(dev, devm_iio_channel_free, channel);
 	if (ret)
@@ -436,7 +456,11 @@ struct iio_channel *iio_channel_get_all(struct device *dev)
 		return ERR_PTR(-EINVAL);
 
 	chans = of_iio_channel_get_all(dev);
-	if (chans)
+	/*
+	 * We only want to carry on if the error is -ENODEV.  Anything else
+	 * should be reported up the stack.
+	 */
+	if (!IS_ERR(chans) || PTR_ERR(chans) != -ENODEV)
 		return chans;
 
 	name = dev_name(dev);