gpio-charger: Fix potential race between irq handler and probe/remove
This patch fixes a potential race between the irq handler and the probe
and remove functions.
The irq should not be requested before the chargers power_supply has been
registered and has to be freed before the power_supply is unregistered,
otherwise it is possible that the irq fires while the power_supply is not
initialized yet or has already been freed.
While we are at it replace request_irq with request_any_context_irq.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Anton Vorontsov <cbouatmailru@gmail.com>
diff --git a/drivers/power/gpio-charger.c b/drivers/power/gpio-charger.c
index 43078e3..25b88ac 100644
--- a/drivers/power/gpio-charger.c
+++ b/drivers/power/gpio-charger.c
@@ -98,7 +98,7 @@
charger->type = pdata->type;
charger->properties = gpio_charger_properties;
charger->num_properties = ARRAY_SIZE(gpio_charger_properties);
- charger->get_property = gpio_charger_get_property;
+ charger->get_property = gpio_charger_get_property;
charger->supplied_to = pdata->supplied_to;
charger->num_supplicants = pdata->num_supplicants;
@@ -113,9 +113,18 @@
goto err_gpio_free;
}
+ gpio_charger->pdata = pdata;
+
+ ret = power_supply_register(&pdev->dev, charger);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "Failed to register power supply: %d\n",
+ ret);
+ goto err_gpio_free;
+ }
+
irq = gpio_to_irq(pdata->gpio);
if (irq > 0) {
- ret = request_irq(irq, gpio_charger_irq,
+ ret = request_any_context_irq(irq, gpio_charger_irq,
IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
dev_name(&pdev->dev), charger);
if (ret)
@@ -124,21 +133,10 @@
gpio_charger->irq = irq;
}
- gpio_charger->pdata = pdata;
-
- ret = power_supply_register(&pdev->dev, charger);
- if (ret < 0) {
- dev_err(&pdev->dev, "Failed to register power supply: %d\n", ret);
- goto err_irq_free;
- }
-
platform_set_drvdata(pdev, gpio_charger);
return 0;
-err_irq_free:
- if (gpio_charger->irq)
- free_irq(gpio_charger->irq, charger);
err_gpio_free:
gpio_free(pdata->gpio);
err_free:
@@ -150,10 +148,11 @@
{
struct gpio_charger *gpio_charger = platform_get_drvdata(pdev);
- power_supply_unregister(&gpio_charger->charger);
-
if (gpio_charger->irq)
free_irq(gpio_charger->irq, &gpio_charger->charger);
+
+ power_supply_unregister(&gpio_charger->charger);
+
gpio_free(gpio_charger->pdata->gpio);
platform_set_drvdata(pdev, NULL);