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gpio: amd8111: Fix PCI device reference count leak

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[ Upstream commit 45fecdb9f6 ]

for_each_pci_dev() is implemented by pci_get_device(). The comment of
pci_get_device() says that it will increase the reference count for the
returned pci_dev and also decrease the reference count for the input
pci_dev @from if it is not NULL.

If we break for_each_pci_dev() loop with pdev not NULL, we need to call
pci_dev_put() to decrease the reference count. Add the missing
pci_dev_put() after the 'out' label. Since pci_dev_put() can handle NULL
input parameter, there is no problem for the 'Device not found' branch.
For the normal path, add pci_dev_put() in amd_gpio_exit().

Fixes: f942a7de04 ("gpio: add a driver for GPIO pins found on AMD-8111 south bridge chips")
Signed-off-by: Xiongfeng Wang <wangxiongfeng2@huawei.com>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Xiongfeng Wang 2022-11-22 20:35:08 +08:00 committed by Greg Kroah-Hartman
parent b9aca69a6c
commit 5ee6413d3d
1 changed files with 4 additions and 0 deletions
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4
drivers/gpio/gpio-amd8111.c
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@ -231,7 +231,10 @@ static int __init amd_gpio_init(void)
ioport_unmap(gp.pm);
goto out;
}
return 0;
out:
pci_dev_put(pdev);
return err;
}
@ -239,6 +242,7 @@ static void __exit amd_gpio_exit(void)
{
gpiochip_remove(&gp.chip);
ioport_unmap(gp.pm);
pci_dev_put(gp.pdev);
}
module_init(amd_gpio_init);