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Subject[PATCH] POWER: gpio-charger: Fix potential race between irq handler and probe/remove function
Date
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>
---
drivers/power/gpio-charger.c | 28 +++++++++++++---------------
1 files changed, 13 insertions(+), 15 deletions(-)

diff --git a/drivers/power/gpio-charger.c b/drivers/power/gpio-charger.c
index 8458caf..016d5c0 100644
--- a/drivers/power/gpio-charger.c
+++ b/drivers/power/gpio-charger.c
@@ -98,7 +98,7 @@ static int __devinit gpio_charger_probe(struct platform_device *pdev)
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 +113,17 @@ static int __devinit gpio_charger_probe(struct platform_device *pdev)
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 +132,10 @@ static int __devinit gpio_charger_probe(struct platform_device *pdev)
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 +147,11 @@ static int __devexit gpio_charger_remove(struct platform_device *pdev)
{
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);
--
1.5.6.5


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