6.6-stable review patch. If anyone has any objections, please let me know.
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From: Haotian Zhang vulab@iscas.ac.cn
[ Upstream commit 5bcc5786a0cfa9249ccbe539833040a6285d0de3 ]
If pm_runtime_put_sync() fails after watchdog_register_device() succeeds, the probe function jumps to err_exit without unregistering the watchdog device. This leaves the watchdog registered in the subsystem while the driver fails to load, resulting in a resource leak.
Add a new error label err_unregister_wdt to properly unregister the watchdog device.
Fixes: 8bc22a2f1bf0 ("watchdog: starfive: Check pm_runtime_enabled() before decrementing usage counter") Signed-off-by: Haotian Zhang vulab@iscas.ac.cn Reviewed-by: Wim Van Sebroeck wim@linux-watchdog.org Signed-off-by: Guenter Roeck linux@roeck-us.net Signed-off-by: Wim Van Sebroeck wim@linux-watchdog.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/watchdog/starfive-wdt.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/watchdog/starfive-wdt.c b/drivers/watchdog/starfive-wdt.c index e4b344db38030..0606142ffc5e2 100644 --- a/drivers/watchdog/starfive-wdt.c +++ b/drivers/watchdog/starfive-wdt.c @@ -498,12 +498,14 @@ static int starfive_wdt_probe(struct platform_device *pdev) if (pm_runtime_enabled(&pdev->dev)) { ret = pm_runtime_put_sync(&pdev->dev); if (ret) - goto err_exit; + goto err_unregister_wdt; } }
return 0;
+err_unregister_wdt: + watchdog_unregister_device(&wdt->wdd); err_exit: starfive_wdt_disable_clock(wdt); pm_runtime_disable(&pdev->dev);