[PATCH 5.10 217/717] serial: 8250-mtk: Fix reference leak in mtk8250_probe

Greg Kroah-Hartman
2020-12-28T14:11:33Z

From: Zhang Qilong <zhangqilong3@huawei.com>

[ Upstream commit 6e4e636e0e3e0b5deffc5e233adcb2cd4e68f2d0 ]

The pm_runtime_enable will increase power disable depth.
Thus a pairing decrement is needed on the error handling
path to keep it balanced according to context.

Fixes: e32a83c70cf98 ("serial: 8250-mtk: modify mtk uart power and clock management")
Signed-off-by: Zhang Qilong <zhangqilong3@huawei.com>
Link: https://lore.kernel.org/r/20201119141126.168850-1-zhangqilong3@huawei.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/tty/serial/8250/8250_mtk.c | 13 ++++++++++---
1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/drivers/tty/serial/8250/8250_mtk.c b/drivers/tty/serial/8250/8250_mtk.c
index fa876e2c13e5d..f7d3023f860f0 100644
--- a/drivers/tty/serial/8250/8250_mtk.c
+++ b/drivers/tty/serial/8250/8250_mtk.c
@@ -572,15 +572,22 @@ static int mtk8250_probe(struct platform_device *pdev)
pm_runtime_enable(&pdev->dev);
err = mtk8250_runtime_resume(&pdev->dev);
if (err)
- return err;
+ goto err_pm_disable;

data->line = serial8250_register_8250_port(&uart);
- if (data->line < 0)
- return data->line;
+ if (data->line < 0) {
+ err = data->line;
+ goto err_pm_disable;
+ }

data->rx_wakeup_irq = platform_get_irq_optional(pdev, 1);

return 0;
+
+err_pm_disable:
+ pm_runtime_disable(&pdev->dev);
+
+ return err;
}

static int mtk8250_remove(struct platform_device *pdev)
--
2.27.0