linux-kernel - [PATCH 5/6] pinctrl: rockchip: fix crash caused by invalid gpio bank

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Message-Id: <20200831085010.7235-1-jay.xu@rock-chips.com>
Date:   Mon, 31 Aug 2020 16:50:10 +0800
From:   Jianqun Xu <jay.xu@...k-chips.com>
To:     linus.walleij@...aro.org, heiko@...ech.de
Cc:     linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-rockchip@...ts.infradead.org,
        Jianqun Xu <jay.xu@...k-chips.com>
Subject: [PATCH 5/6] pinctrl: rockchip: fix crash caused by invalid gpio bank

Add valid check for gpio bank.

Change-Id: Ia4609c3045b5df7879beab3c15d791ff54a1f49b
Signed-off-by: Jianqun Xu <jay.xu@...k-chips.com>
---
 drivers/pinctrl/pinctrl-rockchip.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/pinctrl/pinctrl-rockchip.c b/drivers/pinctrl/pinctrl-rockchip.c
index 6080573155f6..5b16b69e311f 100644
--- a/drivers/pinctrl/pinctrl-rockchip.c
+++ b/drivers/pinctrl/pinctrl-rockchip.c
@@ -2526,9 +2526,9 @@ static int rockchip_pmx_set(struct pinctrl_dev *pctldev, unsigned selector,
 			break;
 	}
 
-	if (ret) {
+	if (ret && cnt) {
 		/* revert the already done pin settings */
-		for (cnt--; cnt >= 0; cnt--)
+		for (cnt--; cnt >= 0 && !data[cnt].func; cnt--)
 			rockchip_set_mux(bank, pins[cnt] - bank->pin_base, 0);
 
 		return ret;
@@ -2599,9 +2599,13 @@ static int rockchip_pmx_gpio_set_direction(struct pinctrl_dev *pctldev,
 					      unsigned offset, bool input)
 {
 	struct rockchip_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
+	struct rockchip_pin_bank *bank = &info->ctrl->pin_banks[offset / 32];
 	struct gpio_chip *chip;
 	int pin;
 
+	if (!bank || !bank->valid)
+		return 0;
+
 	chip = range->gc;
 	pin = offset - chip->base;
 	dev_dbg(info->dev, "gpio_direction for pin %u as %s-%d to %s\n",
@@ -3022,6 +3026,8 @@ static int rockchip_pinctrl_register(struct platform_device *pdev,
 
 	for (bank = 0; bank < info->ctrl->nr_banks; ++bank) {
 		pin_bank = &info->ctrl->pin_banks[bank];
+		if (!pin_bank->valid)
+			continue;
 		pin_bank->grange.name = pin_bank->name;
 		pin_bank->grange.id = bank;
 		pin_bank->grange.pin_base = pin_bank->pin_base;
-- 
2.17.1