Linux-GPIO Archive on lore.kernel.org
 help / color / Atom feed
From: Light Hsieh <light.hsieh@mediatek.com>
To: <linus.walleij@linaro.org>
Cc: <linux-mediatek@lists.infradead.org>,
	<linux-gpio@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
	<sean.wang@kernel.org>, Light Hsieh <light.hsieh@mediatek.com>
Subject: [PATCH v2 1/5] pinctrl: mediatek: Check gpio pin number and use binary  search in mtk_hw_pin_field_lookup()
Date: Thu, 5 Sep 2019 13:53:12 +0800
Message-ID: <1567662796-25508-1-git-send-email-light.hsieh@mediatek.com> (raw)

From: Light Hsieh <light.hsieh@mediatek.com>

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. Use binary search in mtk_hw_pin_field_lookup()
   Modify mtk_hw_pin_field_lookup() to use binary search for accelerating
   search.

---
 drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c | 24 +++++++++++++++++++-----
 drivers/pinctrl/mediatek/pinctrl-paris.c         | 19 +++++++++++++++++++
 2 files changed, 38 insertions(+), 5 deletions(-)

diff --git a/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c b/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c
index 20e1c89..4687f63 100644
--- a/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c
+++ b/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c
@@ -68,7 +68,7 @@ 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;
-	u32 bits;
+	u32 bits, start = 0, end, found = 0, check;
 
 	if (hw->soc->reg_cal && hw->soc->reg_cal[field].range) {
 		rc = &hw->soc->reg_cal[field];
@@ -79,21 +79,32 @@ static int mtk_hw_pin_field_lookup(struct mtk_pinctrl *hw,
 		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 = 1;
 			break;
-		c++;
+		} else if (start == end)
+			break;
+		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 +193,9 @@ 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..28b4951 100644
--- a/drivers/pinctrl/mediatek/pinctrl-paris.c
+++ b/drivers/pinctrl/mediatek/pinctrl-paris.c
@@ -693,6 +693,9 @@ 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 +711,9 @@ 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 +728,9 @@ 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 +738,22 @@ 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


             reply index

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-05  5:53 Light Hsieh [this message]
2019-09-05  5:53 ` [PATCH v2 2/5] pinctrl: mediatek: Supporting driving setting without mapping current to register value Light Hsieh
2019-09-05  5:53 ` [PATCH v2 3/5] pinctrl: mediatek: Refine mtk_pinconf_get() and mtk_pinconf_set() Light Hsieh
2019-09-13 12:39   ` Linus Walleij
2019-09-05  5:53 ` [PATCH v2 4/5] pinctrl: mediatek: Backward compatible to previous Mediatek's bias-pull usage Light Hsieh
2019-09-05  5:53 ` [PATCH v2 5/5] pinctrl: mediatek: Add support for pin configuration dump via debugfs Light Hsieh
2019-09-05  6:00 ` [PATCH v2 1/5] pinctrl: mediatek: Check gpio pin number and use binary search in mtk_hw_pin_field_lookup() Light Hsieh
2019-09-11  9:29   ` Linus Walleij
2019-09-11 17:27     ` Sean Wang
2019-09-12 13:43   ` Linus Walleij
2019-09-13 12:40     ` Linus Walleij

Reply instructions:

You may reply publically to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=1567662796-25508-1-git-send-email-light.hsieh@mediatek.com \
    --to=light.hsieh@mediatek.com \
    --cc=linus.walleij@linaro.org \
    --cc=linux-gpio@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-mediatek@lists.infradead.org \
    --cc=sean.wang@kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

Linux-GPIO Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-gpio/0 linux-gpio/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-gpio linux-gpio/ https://lore.kernel.org/linux-gpio \
		linux-gpio@vger.kernel.org linux-gpio@archiver.kernel.org
	public-inbox-index linux-gpio

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-gpio


AGPL code for this site: git clone https://public-inbox.org/ public-inbox