[PATCH 3/3] pinctrl: pinmux: handle radix_tree_insert() errors in pinmux_generic_add_function()

[Sergey Shtylyov <s.shtylyov@xxxxxx>]

pinctrl_generic_add_function() doesn't check result of radix_tree_insert()
despite they both may return a negative error code.  Linus Walleij said he
has copied the radix tree code from kernel/irq/ where the functions calling
radix_tree_insert() are *void* themselves; I think it makes more sense to
propagate the errors from radix_tree_insert() upstream if we can do that...

Found by Linux Verification Center (linuxtesting.org) with the Svace static
analysis tool.

Signed-off-by: Sergey Shtylyov <s.shtylyov@xxxxxx>
---
 drivers/pinctrl/pinmux.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/pinctrl/pinmux.c b/drivers/pinctrl/pinmux.c
index 82c750a31952..2a180a5d64a4 100644
--- a/drivers/pinctrl/pinmux.c
+++ b/drivers/pinctrl/pinmux.c
@@ -872,7 +872,7 @@ int pinmux_generic_add_function(struct pinctrl_dev *pctldev,
 				void *data)
 {
 	struct function_desc *function;
-	int selector;
+	int selector, error;
 
 	if (!name)
 		return -EINVAL;
@@ -892,7 +892,9 @@ int pinmux_generic_add_function(struct pinctrl_dev *pctldev,
 	function->num_group_names = num_groups;
 	function->data = data;
 
-	radix_tree_insert(&pctldev->pin_function_tree, selector, function);
+	error = radix_tree_insert(&pctldev->pin_function_tree, selector, function);
+	if (error)
+		return error;
 
 	pctldev->num_functions++;
 
-- 
2.26.3