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From: dianders@chromium.org (Doug Anderson)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 4/4] pinctrl: rockchip: Protect read-modify-write with the spinlock
Date: Mon, 20 Oct 2014 16:27:50 -0700
Message-ID: <1413847670-12245-4-git-send-email-dianders@chromium.org> (raw)
In-Reply-To: <1413847670-12245-1-git-send-email-dianders@chromium.org>

There were a few instances where the rockchip pinctrl driver would do
read-modify-write with no spinlock.  Add a spinlock for these cases.

Signed-off-by: Doug Anderson <dianders@chromium.org>
---
 drivers/pinctrl/pinctrl-rockchip.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/drivers/pinctrl/pinctrl-rockchip.c b/drivers/pinctrl/pinctrl-rockchip.c
index 14a5683..669e5e8 100644
--- a/drivers/pinctrl/pinctrl-rockchip.c
+++ b/drivers/pinctrl/pinctrl-rockchip.c
@@ -871,6 +871,8 @@ static int _rockchip_pmx_gpio_set_direction(struct gpio_chip *gc,
 	if (ret < 0)
 		return ret;
 
+	spin_lock_irqsave(&bank->slock, flags);
+
 	data = readl_relaxed(bank->reg_base + GPIO_SWPORT_DDR);
 	/* set bit to 1 for output, 0 for input */
 	if (!input)
@@ -879,6 +881,8 @@ static int _rockchip_pmx_gpio_set_direction(struct gpio_chip *gc,
 		data &= ~BIT(pin);
 	writel_relaxed(data, bank->reg_base + GPIO_SWPORT_DDR);
 
+	spin_unlock_irqrestore(&bank->slock, flags);
+
 	return 0;
 }
 
@@ -1395,6 +1399,7 @@ static void rockchip_irq_demux(unsigned int irq, struct irq_desc *desc)
 	u32 polarity = 0, data = 0;
 	u32 pend;
 	bool edge_changed = false;
+	unsigned long flags;
 
 	dev_dbg(bank->drvdata->dev, "got irq for bank %s\n", bank->name);
 
@@ -1440,10 +1445,14 @@ static void rockchip_irq_demux(unsigned int irq, struct irq_desc *desc)
 
 	if (bank->toggle_edge_mode && edge_changed) {
 		/* Interrupt params should only be set with ints disabled */
+		spin_lock_irqsave(&bank->slock, flags);
+
 		data = readl_relaxed(bank->reg_base + GPIO_INTEN);
 		writel_relaxed(0, bank->reg_base + GPIO_INTEN);
 		writel(polarity, bank->reg_base + GPIO_INT_POLARITY);
 		writel(data, bank->reg_base + GPIO_INTEN);
+
+		spin_unlock_irqrestore(&bank->slock, flags);
 	}
 
 	chained_irq_exit(chip, desc);
@@ -1457,6 +1466,7 @@ static int rockchip_irq_set_type(struct irq_data *d, unsigned int type)
 	u32 polarity;
 	u32 level;
 	u32 data;
+	unsigned long flags;
 	int ret;
 
 	/* make sure the pin is configured as gpio input */
@@ -1464,15 +1474,20 @@ static int rockchip_irq_set_type(struct irq_data *d, unsigned int type)
 	if (ret < 0)
 		return ret;
 
+	spin_lock_irqsave(&bank->slock, flags);
+
 	data = readl_relaxed(bank->reg_base + GPIO_SWPORT_DDR);
 	data &= ~mask;
 	writel_relaxed(data, bank->reg_base + GPIO_SWPORT_DDR);
 
+	spin_unlock_irqrestore(&bank->slock, flags);
+
 	if (type & IRQ_TYPE_EDGE_BOTH)
 		__irq_set_handler_locked(d->irq, handle_edge_irq);
 	else
 		__irq_set_handler_locked(d->irq, handle_level_irq);
 
+	spin_lock_irqsave(&bank->slock, flags);
 	irq_gc_lock(gc);
 
 	level = readl_relaxed(gc->reg_base + GPIO_INTTYPE_LEVEL);
@@ -1522,6 +1537,7 @@ static int rockchip_irq_set_type(struct irq_data *d, unsigned int type)
 	writel_relaxed(polarity, gc->reg_base + GPIO_INT_POLARITY);
 
 	irq_gc_unlock(gc);
+	spin_unlock_irqrestore(&bank->slock, flags);
 
 	return 0;
 }
-- 
2.1.0.rc2.206.gedb03e5

  parent reply index

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-10-20 23:27 [PATCH 1/4] pinctrl: rockchip: Set wake_enabled Doug Anderson
2014-10-20 23:27 ` [PATCH 2/4] pinctrl: rockchip: Don't call pinctrl_gpio_direction_output() in pin_config_set() Doug Anderson
2014-10-21  0:18   ` Chris Zhong
2014-10-21 16:32   ` Doug Anderson
2014-10-20 23:27 ` [PATCH 3/4] pinctrl: rockchip: Parse pin groups before calling pinctrl_register() Doug Anderson
2014-10-21  0:19   ` Chris Zhong
2014-10-20 23:27 ` Doug Anderson [this message]
2014-10-20 23:57   ` [PATCH 4/4] pinctrl: rockchip: Protect read-modify-write with the spinlock Doug Anderson
2014-10-21  0:15 ` [PATCH 1/4] pinctrl: rockchip: Set wake_enabled Chris Zhong
2014-10-28 15:51 ` Linus Walleij
2014-10-28 16:06   ` Doug Anderson

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