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Message-ID: <1577799707-11855-1-git-send-email-light.hsieh@mediatek.com>
Date: Tue, 31 Dec 2019 21:41:42 +0800
From: Light Hsieh <light.hsieh@...iatek.com>
To: <linus.walleij@...aro.org>
CC: <linux-mediatek@...ts.infradead.org>, <linux-gpio@...r.kernel.org>,
<linux-kernel@...r.kernel.org>, <sean.wang@...nel.org>,
<kuohong.wang@...iatek.com>, Light Hsieh <light.hsieh@...iatek.com>
Subject: [PATCH v7 1/6] Check gpio pin number and use binary search in mtk_hw_pin_field_lookup()
1. Check if gpio pin number is in valid range to prevent from get invalid
pointer 'desc' in the following code:
desc = (const struct mtk_pin_desc *)&hw->soc->pins[gpio];
2. Improve mtk_hw_pin_field_lookup()
2.1 Modify mtk_hw_pin_field_lookup() to use binary search for accelerating
search.
2.2 Correct message after the following check fail:
if (hw->soc->reg_cal && hw->soc->reg_cal[field].range) {
rc = &hw->soc->reg_cal[field];
The original message is:
"Not support field %d for pin %d (%s)\n"
However, the check is on soc chip level, not on pin level yet.
So the message is corrected as:
"Not support field %d for this soc\n"
Change-Id: I498a18df73e6a693e0e35635d5b92b8dc9c063ac
---
drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c | 27 ++++++++++++++++++------
drivers/pinctrl/mediatek/pinctrl-paris.c | 25 ++++++++++++++++++++++
2 files changed, 46 insertions(+), 6 deletions(-)
diff --git a/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c b/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c
index 20e1c89..d63e05e 100644
--- a/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c
+++ b/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c
@@ -68,32 +68,44 @@ static int mtk_hw_pin_field_lookup(struct mtk_pinctrl *hw,
{
const struct mtk_pin_field_calc *c, *e;
const struct mtk_pin_reg_calc *rc;
+ int start = 0, end, check;
+ bool found = false;
u32 bits;
if (hw->soc->reg_cal && hw->soc->reg_cal[field].range) {
rc = &hw->soc->reg_cal[field];
} else {
dev_dbg(hw->dev,
- "Not support field %d for pin %d (%s)\n",
- field, desc->number, desc->name);
+ "Not support field %d for this soc\n", field);
return -ENOTSUPP;
}
+ end = rc->nranges - 1;
c = rc->range;
e = c + rc->nranges;
- while (c < e) {
- if (desc->number >= c->s_pin && desc->number <= c->e_pin)
+ while (start <= end) {
+ check = (start + end) >> 1;
+ if (desc->number >= rc->range[check].s_pin
+ && desc->number <= rc->range[check].e_pin) {
+ found = true;
+ break;
+ } else if (start == end)
break;
- c++;
+ else if (desc->number < rc->range[check].s_pin)
+ end = check - 1;
+ else
+ start = check + 1;
}
- if (c >= e) {
+ if (!found) {
dev_dbg(hw->dev, "Not support field %d for pin = %d (%s)\n",
field, desc->number, desc->name);
return -ENOTSUPP;
}
+ c = rc->range + check;
+
if (c->i_base > hw->nbase - 1) {
dev_err(hw->dev,
"Invalid base for field %d for pin = %d (%s)\n",
@@ -182,6 +194,9 @@ int mtk_hw_set_value(struct mtk_pinctrl *hw, const struct mtk_pin_desc *desc,
if (err)
return err;
+ if (value < 0 || value > pf.mask)
+ return -EINVAL;
+
if (!pf.next)
mtk_rmw(hw, pf.index, pf.offset, pf.mask << pf.bitpos,
(value & pf.mask) << pf.bitpos);
diff --git a/drivers/pinctrl/mediatek/pinctrl-paris.c b/drivers/pinctrl/mediatek/pinctrl-paris.c
index 923264d..3e13ae7 100644
--- a/drivers/pinctrl/mediatek/pinctrl-paris.c
+++ b/drivers/pinctrl/mediatek/pinctrl-paris.c
@@ -81,6 +81,8 @@ static int mtk_pinconf_get(struct pinctrl_dev *pctldev,
int val, val2, err, reg, ret = 1;
const struct mtk_pin_desc *desc;
+ if (pin >= hw->soc->npins)
+ return -EINVAL;
desc = (const struct mtk_pin_desc *)&hw->soc->pins[pin];
switch (param) {
@@ -206,6 +208,10 @@ static int mtk_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
int err = 0;
u32 reg;
+ if (pin >= hw->soc->npins) {
+ err = -EINVAL;
+ goto err;
+ }
desc = (const struct mtk_pin_desc *)&hw->soc->pins[pin];
switch ((u32)param) {
@@ -693,6 +699,9 @@ static int mtk_gpio_get_direction(struct gpio_chip *chip, unsigned int gpio)
const struct mtk_pin_desc *desc;
int value, err;
+ if (gpio > hw->soc->npins)
+ return -EINVAL;
+
desc = (const struct mtk_pin_desc *)&hw->soc->pins[gpio];
err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_DIR, &value);
@@ -708,6 +717,9 @@ static int mtk_gpio_get(struct gpio_chip *chip, unsigned int gpio)
const struct mtk_pin_desc *desc;
int value, err;
+ if (gpio > hw->soc->npins)
+ return -EINVAL;
+
desc = (const struct mtk_pin_desc *)&hw->soc->pins[gpio];
err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_DI, &value);
@@ -722,6 +734,9 @@ static void mtk_gpio_set(struct gpio_chip *chip, unsigned int gpio, int value)
struct mtk_pinctrl *hw = gpiochip_get_data(chip);
const struct mtk_pin_desc *desc;
+ if (gpio > hw->soc->npins)
+ return;
+
desc = (const struct mtk_pin_desc *)&hw->soc->pins[gpio];
mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DO, !!value);
@@ -729,12 +744,22 @@ static void mtk_gpio_set(struct gpio_chip *chip, unsigned int gpio, int value)
static int mtk_gpio_direction_input(struct gpio_chip *chip, unsigned int gpio)
{
+ struct mtk_pinctrl *hw = gpiochip_get_data(chip);
+
+ if (gpio > hw->soc->npins)
+ return -EINVAL;
+
return pinctrl_gpio_direction_input(chip->base + gpio);
}
static int mtk_gpio_direction_output(struct gpio_chip *chip, unsigned int gpio,
int value)
{
+ struct mtk_pinctrl *hw = gpiochip_get_data(chip);
+
+ if (gpio > hw->soc->npins)
+ return -EINVAL;
+
mtk_gpio_set(chip, gpio, value);
return pinctrl_gpio_direction_output(chip->base + gpio);
--
1.8.1.1.dirty
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