lkml.org 
[lkml]   [2022]   [Nov]   [23]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] watchdog: sp5100_tco: Fix PCI device refcount leak
On Tue, Nov 22, 2022 at 07:56:51PM +0800, Xiongfeng Wang wrote:
> 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 out 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() in error path of sp5100_tco_init() and also when we unload
> module.
>
> Fixes: 15e28bf13008 ("watchdog: Add support for sp5100 chipset TCO")
> Signed-off-by: Xiongfeng Wang <wangxiongfeng2@huawei.com>

Reviewed-by: Guenter Roeck <linux@roeck-us.net>

> ---
> drivers/watchdog/sp5100_tco.c | 5 ++++-
> 1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/watchdog/sp5100_tco.c b/drivers/watchdog/sp5100_tco.c
> index fb426b7d81da..f00f26f90444 100644
> --- a/drivers/watchdog/sp5100_tco.c
> +++ b/drivers/watchdog/sp5100_tco.c
> @@ -599,7 +599,7 @@ static int __init sp5100_tco_init(void)
>
> err = platform_driver_register(&sp5100_tco_driver);
> if (err)
> - return err;
> + goto put_dev;
>
> sp5100_tco_platform_device =
> platform_device_register_simple(TCO_DRIVER_NAME, -1, NULL, 0);
> @@ -612,6 +612,8 @@ static int __init sp5100_tco_init(void)
>
> unreg_platform_driver:
> platform_driver_unregister(&sp5100_tco_driver);
> +put_dev:
> + pci_dev_put(sp5100_tco_pci);
> return err;
> }
>
> @@ -619,6 +621,7 @@ static void __exit sp5100_tco_exit(void)
> {
> platform_device_unregister(sp5100_tco_platform_device);
> platform_driver_unregister(&sp5100_tco_driver);
> + pci_dev_put(sp5100_tco_pci);
> }
>
> module_init(sp5100_tco_init);
> --
> 2.20.1
>

\
 
 \ /
  Last update: 2022-11-23 17:23    [W:0.034 / U:0.236 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site