gpio_hog is trying to use gpio functions during probe call.
At that time we dont have initialized port data which are dereferenced
via assigned gpio.direction_input/output functions.
This results in unable to handle kernel NULL pointer dereference
followed by Kernel panic.
This patch prevents that.
Signed-off-by: Radim Pavlik <radim.pavlik@xxxxxxxxxxxxxxxxxx>
---
drivers/tty/serial/sc16is7xx.c | 38 +++++++++++++++++-----------------
1 file changed, 19 insertions(+), 19 deletions(-)
diff --git a/drivers/tty/serial/sc16is7xx.c b/drivers/tty/serial/sc16is7xx.c
index 64e7e6c8145f..9f4c5d64fb10 100644
--- a/drivers/tty/serial/sc16is7xx.c
+++ b/drivers/tty/serial/sc16is7xx.c
@@ -1242,25 +1242,6 @@ static int sc16is7xx_probe(struct device *dev,
}
sched_set_fifo(s->kworker_task);
-#ifdef CONFIG_GPIOLIB
- if (devtype->nr_gpio) {
- /* Setup GPIO cotroller */
- s->gpio.owner = THIS_MODULE;
- s->gpio.parent = dev;
- s->gpio.label = dev_name(dev);
- s->gpio.direction_input = sc16is7xx_gpio_direction_input;
- s->gpio.get = sc16is7xx_gpio_get;
- s->gpio.direction_output = sc16is7xx_gpio_direction_output;
- s->gpio.set = sc16is7xx_gpio_set;
- s->gpio.base = -1;
- s->gpio.ngpio = devtype->nr_gpio;
- s->gpio.can_sleep = 1;
- ret = gpiochip_add_data(&s->gpio, s);
- if (ret)
- goto out_thread;
- }
-#endif
-
/* reset device, purging any pending irq / data */
regmap_write(s->regmap, SC16IS7XX_IOCONTROL_REG << SC16IS7XX_REG_SHIFT,
SC16IS7XX_IOCONTROL_SRESET_BIT);
@@ -1315,6 +1296,25 @@ static int sc16is7xx_probe(struct device *dev,
sc16is7xx_power(&s->p[i].port, 0);
}
+#ifdef CONFIG_GPIOLIB
+ if (devtype->nr_gpio) {
+ /* Setup GPIO cotroller */
+ s->gpio.owner = THIS_MODULE;
+ s->gpio.parent = dev;
+ s->gpio.label = dev_name(dev);
+ s->gpio.direction_input = sc16is7xx_gpio_direction_input;
+ s->gpio.get = sc16is7xx_gpio_get;
+ s->gpio.direction_output = sc16is7xx_gpio_direction_output;
+ s->gpio.set = sc16is7xx_gpio_set;
+ s->gpio.base = -1;
+ s->gpio.ngpio = devtype->nr_gpio;
+ s->gpio.can_sleep = 1;
+ ret = gpiochip_add_data(&s->gpio, s);
+ if (ret)
+ goto out_thread;
+ }
+#endif
+
if (dev->of_node) {
struct property *prop;
const __be32 *p;
--
2.32.0
