On Sun, Jan 06, 2013 at 09:43:10AM +0100, Julia Lawall wrote:
> From: Julia Lawall <julia.law...@lip6.fr>
>
> devm_kzalloc should not be followed by kfree, as this results in a double
> free. The problem was found using the following semantic match
> (http://coccinelle.lip6.fr/):
>
> // <smpl>
> @@
> expression x,e;
> @@
> x = devm_kzalloc(...)
> ... when != x = e
> ?-kfree(x,...);
> // </smpl>
>
> Furthermore, in the remove function, the calls to free_irq are moved up to
> prevent a possible reference in the interrupt handler to resources freed by
> power_supply_unregister.
>
> Signed-off-by: Julia Lawall <julia.law...@lip6.fr>
>
> ---
> V2, moving up the calls to free_irq, instead of removing them and using
> devm_request_threaded_irq.
The patch is whitespace-damaged (for some reason there are two spaces in
the beginning of each non-change line). I repeated changes manually, but
you might want to fix your mail/patch setup anyway. :)
Thanks.
> drivers/power/88pm860x_battery.c | 13 ++++---------
> 1 file changed, 4 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/power/88pm860x_battery.c
> b/drivers/power/88pm860x_battery.c
> index 8bc80b0..d338c1c 100644
> --- a/drivers/power/88pm860x_battery.c
> +++ b/drivers/power/88pm860x_battery.c
> @@ -915,15 +915,13 @@ static int pm860x_battery_probe(struct platform_device
> *pdev)
> info->irq_cc = platform_get_irq(pdev, 0);
> if (info->irq_cc <= 0) {
> dev_err(&pdev->dev, "No IRQ resource!\n");
> - ret = -EINVAL;
> - goto out;
> + return -EINVAL;
> }
>
> info->irq_batt = platform_get_irq(pdev, 1);
> if (info->irq_batt <= 0) {
> dev_err(&pdev->dev, "No IRQ resource!\n");
> - ret = -EINVAL;
> - goto out;
> + return -EINVAL;
> }
>
> info->chip = chip;
> @@ -957,7 +955,7 @@ static int pm860x_battery_probe(struct platform_device
> *pdev)
>
> ret = power_supply_register(&pdev->dev, &info->battery);
> if (ret)
> - goto out;
> + return ret;
> info->battery.dev->parent = &pdev->dev;
>
> ret = request_threaded_irq(info->irq_cc, NULL,
> @@ -984,8 +982,6 @@ out_coulomb:
> free_irq(info->irq_cc, info);
> out_reg:
> power_supply_unregister(&info->battery);
> -out:
> - kfree(info);
> return ret;
> }
>
> @@ -993,10 +989,9 @@ static int pm860x_battery_remove(struct platform_device
> *pdev)
> {
> struct pm860x_battery_info *info = platform_get_drvdata(pdev);
>
> - power_supply_unregister(&info->battery);
> free_irq(info->irq_batt, info);
> free_irq(info->irq_cc, info);
> - kfree(info);
> + power_supply_unregister(&info->battery);
> platform_set_drvdata(pdev, NULL);
> return 0;
> }
>
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