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Date:   Thu, 6 Jun 2019 18:11:44 -0500
From:   "Gustavo A. R. Silva" <>
To:     Linus Walleij <>
        "Gustavo A. R. Silva" <>,
        Kees Cook <>
Subject: [PATCH v2] pinctrl: tb10x: Use flexible-array member and
 struct_size() helper

Update the code to use a flexible array member instead of a pointer in
structure tb10x_pinctrl and use the struct_size() helper:

struct tb10x_pinctrl {
	struct tb10x_of_pinfunc pinfuncs[];

Also, make use of the struct_size() helper instead of an open-coded
version in order to avoid any potential type mistakes.

So, replace the following form:

sizeof(struct tb10x_pinctrl) + of_get_child_count(of_node) * sizeof(struct tb10x_of_pinfunc)


struct_size(state, pinfuncs, of_get_child_count(of_node))

This code was detected with the help of Coccinelle.

Reviewed-by: Kees Cook <>
Signed-off-by: Gustavo A. R. Silva <>
Changes in v2:
 - Update changelog text.
 - Add Kees' Reviewed-by tag.

 drivers/pinctrl/pinctrl-tb10x.c | 12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/drivers/pinctrl/pinctrl-tb10x.c b/drivers/pinctrl/pinctrl-tb10x.c
index 2e90a6d8fb3b..a32badf3f118 100644
--- a/drivers/pinctrl/pinctrl-tb10x.c
+++ b/drivers/pinctrl/pinctrl-tb10x.c
@@ -483,22 +483,22 @@ struct tb10x_port {
  * @base: register set base address.
  * @pingroups: pointer to an array of the pin groups this driver manages.
  * @pinfuncgrpcnt: number of pingroups in @pingroups.
- * @pinfuncs: pointer to an array of pin functions this driver manages.
  * @pinfuncnt: number of pin functions in @pinfuncs.
  * @mutex: mutex for exclusive access to a pin controller's state.
  * @ports: current state of each port.
  * @gpios: Indicates if a given pin is currently used as GPIO (1) or not (0).
+ * @pinfuncs: flexible array of pin functions this driver manages.
 struct tb10x_pinctrl {
 	struct pinctrl_dev *pctl;
 	void *base;
 	const struct tb10x_pinfuncgrp *pingroups;
 	unsigned int pinfuncgrpcnt;
-	struct tb10x_of_pinfunc *pinfuncs;
 	unsigned int pinfuncnt;
 	struct mutex mutex;
 	struct tb10x_port ports[TB10X_PORTS];
+	struct tb10x_of_pinfunc pinfuncs[];
 static inline void tb10x_pinctrl_set_config(struct tb10x_pinctrl *state,
@@ -771,15 +771,13 @@ static int tb10x_pinctrl_probe(struct platform_device *pdev)
 		return -EINVAL;
-	state = devm_kzalloc(dev, sizeof(struct tb10x_pinctrl) +
-					of_get_child_count(of_node)
-					* sizeof(struct tb10x_of_pinfunc),
+	state = devm_kzalloc(dev, struct_size(state, pinfuncs,
+					      of_get_child_count(of_node)),
+			     GFP_KERNEL);
 	if (!state)
 		return -ENOMEM;
 	platform_set_drvdata(pdev, state);
-	state->pinfuncs = (struct tb10x_of_pinfunc *)(state + 1);
 	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);

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