[v2] pinctrl: nomadik: Add check for clk_enable()

Commit Message

Mingwei Zheng Dec. 6, 2024, 10:16 p.m. UTC

Add check for the return value of clk_enable() to catch the potential
error.
Disable success clks in the error handling.
Change return type of nmk_gpio_glitch_slpm_init casade.

Fixes: 3a19805920f1 ("pinctrl: nomadik: move all Nomadik drivers to subdir")
Signed-off-by: Mingwei Zheng <[e-mail]>
Signed-off-by: Jiasheng Jiang <[e-mail]>
---
Changelog:

v1 -> v2:

1. Add clk_disable in error handling.
---
 drivers/pinctrl/nomadik/pinctrl-nomadik.c | 35 ++++++++++++++++++-----
 1 file changed, 28 insertions(+), 7 deletions(-)

Comments

Linus Walleij Dec. 17, 2024, 2:07 p.m. UTC | #1

On Fri, Dec 6, 2024 at 11:13 PM Mingwei Zheng <[e-mail]> wrote:

> Add check for the return value of clk_enable() to catch the potential
> error.
> Disable success clks in the error handling.
> Change return type of nmk_gpio_glitch_slpm_init casade.
>
> Fixes: 3a19805920f1 ("pinctrl: nomadik: move all Nomadik drivers to subdir")
> Signed-off-by: Mingwei Zheng <[e-mail]>
> Signed-off-by: Jiasheng Jiang <[e-mail]>

Oh I took out v1 and applied this instead, I didn't see the bug
but luckily you did!

Yours,
Linus Walleij

Patch

diff --git a/drivers/pinctrl/nomadik/pinctrl-nomadik.c b/drivers/pinctrl/nomadik/pinctrl-nomadik.c
index f4f10c60c1d2..4261541928e9 100644
--- a/drivers/pinctrl/nomadik/pinctrl-nomadik.c
+++ b/drivers/pinctrl/nomadik/pinctrl-nomadik.c
@@ -438,9 +438,9 @@  static void nmk_prcm_altcx_set_mode(struct nmk_pinctrl *npct,
  *  - Any spurious wake up event during switch sequence to be ignored and
  *    cleared
  */
-static void nmk_gpio_glitch_slpm_init(unsigned int *slpm)
+static int nmk_gpio_glitch_slpm_init(unsigned int *slpm)
 {
-	int i;
+	int i, j, ret;
 
 	for (i = 0; i < NMK_MAX_BANKS; i++) {
 		struct nmk_gpio_chip *chip = nmk_gpio_chips[i];
@@ -449,11 +449,21 @@  static void nmk_gpio_glitch_slpm_init(unsigned int *slpm)
 		if (!chip)
 			break;
 
-		clk_enable(chip->clk);
+		ret = clk_enable(chip->clk);
+		if (ret) {
+			for (j = 0; j < i; j++) {
+				chip = nmk_gpio_chips[j];
+				clk_disable(chip->clk);
+			}
 
+			return ret;
+		}
+
 		slpm[i] = readl(chip->addr + NMK_GPIO_SLPC);
 		writel(temp, chip->addr + NMK_GPIO_SLPC);
 	}
+
+	return 0;
 }
 
 static void nmk_gpio_glitch_slpm_restore(unsigned int *slpm)
@@ -923,7 +933,9 @@  static int nmk_pmx_set(struct pinctrl_dev *pctldev, unsigned int function,
 
 			slpm[nmk_chip->bank] &= ~BIT(bit);
 		}
-		nmk_gpio_glitch_slpm_init(slpm);
+		ret = nmk_gpio_glitch_slpm_init(slpm);
+		if (ret)
+			goto out_pre_slpm_init;
 	}
 
 	for (i = 0; i < g->grp.npins; i++) {
@@ -940,7 +952,10 @@  static int nmk_pmx_set(struct pinctrl_dev *pctldev, unsigned int function,
 		dev_dbg(npct->dev, "setting pin %d to altsetting %d\n",
 			g->grp.pins[i], g->altsetting);
 
-		clk_enable(nmk_chip->clk);
+		ret = clk_enable(nmk_chip->clk);
+		if (ret)
+			goto out_glitch;
+
 		/*
 		 * If the pin is switching to altfunc, and there was an
 		 * interrupt installed on it which has been lazy disabled,
@@ -988,6 +1003,7 @@  static int nmk_gpio_request_enable(struct pinctrl_dev *pctldev,
 	struct nmk_gpio_chip *nmk_chip;
 	struct gpio_chip *chip;
 	unsigned int bit;
+	int ret;
 
 	if (!range) {
 		dev_err(npct->dev, "invalid range\n");
@@ -1004,7 +1020,9 @@  static int nmk_gpio_request_enable(struct pinctrl_dev *pctldev,
 
 	find_nmk_gpio_from_pin(pin, &bit);
 
-	clk_enable(nmk_chip->clk);
+	ret = clk_enable(nmk_chip->clk);
+	if (ret)
+		return ret;
 	/* There is no glitch when converting any pin to GPIO */
 	__nmk_gpio_set_mode(nmk_chip, bit, NMK_GPIO_ALT_GPIO);
 	clk_disable(nmk_chip->clk);
@@ -1058,6 +1076,7 @@  static int nmk_pin_config_set(struct pinctrl_dev *pctldev, unsigned int pin,
 	unsigned long cfg;
 	int pull, slpm, output, val, i;
 	bool lowemi, gpiomode, sleep;
+	int ret;
 
 	nmk_chip = find_nmk_gpio_from_pin(pin, &bit);
 	if (!nmk_chip) {
@@ -1116,7 +1135,9 @@  static int nmk_pin_config_set(struct pinctrl_dev *pctldev, unsigned int pin,
 			output ? (val ? "high" : "low") : "",
 			lowemi ? "on" : "off");
 
-		clk_enable(nmk_chip->clk);
+		ret = clk_enable(nmk_chip->clk);
+		if (ret)
+			return ret;
 		if (gpiomode)
 			/* No glitch when going to GPIO mode */
 			__nmk_gpio_set_mode(nmk_chip, bit, NMK_GPIO_ALT_GPIO);