gpio: vf610: add locking to gpio direction functions

Add locking to `vf610_gpio_direction_input|output()` functions. Without
this locking, a race condition exists between concurrent calls to these
functions, potentially leading to incorrect GPIO direction settings.

To verify the correctness of this fix, a `trylock` patch was applied,
where after a couple of reboots the race was confirmed. I.e., one user
had to wait before acquiring the lock. With this patch the race has not
been encountered. It's worth mentioning that any type of debugging
(printing, tracing, etc.) would "resolve"/hide the issue.

Fixes: 659d8a62311f ("gpio: vf610: add imx7ulp support")
Signed-off-by: Johan Korsnes <johan.korsnes@remarkable.no>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Haibo Chen <haibo.chen@nxp.com>
Cc: Bartosz Golaszewski <brgl@bgdev.pl>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20250217091643.679644-1-johan.korsnes@remarkable.no
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

diff --git a/drivers/gpio/gpio-vf610.c b/drivers/gpio/gpio-vf610.c
index c4f34a347cb6eaa171904eb38ff04767fd6619f0..c36a9dbccd4dd5415ed3b90b87afb47e7634c025 100644 (file)
--- a/drivers/gpio/gpio-vf610.c
+++ b/drivers/gpio/gpio-vf610.c
@@ -36,6 +36,7 @@ struct vf610_gpio_port {
        struct clk *clk_port;
        struct clk *clk_gpio;
        int irq;
+       spinlock_t lock; /* protect gpio direction registers */
 };
 
 #define GPIO_PDOR              0x00
@@ -124,6 +125,7 @@ static int vf610_gpio_direction_input(struct gpio_chip *chip, unsigned int gpio)
        u32 val;
 
        if (port->sdata->have_paddr) {
+               guard(spinlock_irqsave)(&port->lock);
                val = vf610_gpio_readl(port->gpio_base + GPIO_PDDR);
                val &= ~mask;
                vf610_gpio_writel(val, port->gpio_base + GPIO_PDDR);
@@ -142,6 +144,7 @@ static int vf610_gpio_direction_output(struct gpio_chip *chip, unsigned int gpio
        vf610_gpio_set(chip, gpio, value);
 
        if (port->sdata->have_paddr) {
+               guard(spinlock_irqsave)(&port->lock);
                val = vf610_gpio_readl(port->gpio_base + GPIO_PDDR);
                val |= mask;
                vf610_gpio_writel(val, port->gpio_base + GPIO_PDDR);
@@ -297,6 +300,7 @@ static int vf610_gpio_probe(struct platform_device *pdev)
                return -ENOMEM;
 
        port->sdata = device_get_match_data(dev);
+       spin_lock_init(&port->lock);
 
        dual_base = port->sdata->have_dual_base;