[PATCH 4.9 144/177] serial: 8250_dw: Disable clock on error

[Greg Kroah-Hartman]

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Stefan Potyra <stefan.pot...@elektrobit.com>


[ Upstream commit 8af016aa5a27c6a2505460eb4d83f1e70c38dc43 ]

If there is no clock rate for uartclk defined, disable the previously
enabled clock again.

Found by Linux Driver Verification project (linuxtesting.org).

Fixes: 23f5b3fdd04e serial: 8250_dw: only get the clock rate in one place
Signed-off-by: Stefan Potyra <stefan.pot...@elektrobit.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
Signed-off-by: Sasha Levin <alexander.le...@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 drivers/tty/serial/8250/8250_dw.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/tty/serial/8250/8250_dw.c
+++ b/drivers/tty/serial/8250/8250_dw.c
@@ -464,7 +464,8 @@ static int dw8250_probe(struct platform_
        /* If no clock rate is defined, fail. */
        if (!p->uartclk) {
                dev_err(dev, "clock rate not defined\n");
-               return -EINVAL;
+               err = -EINVAL;
+               goto err_clk;
        }
 
        data->pclk = devm_clk_get(dev, "apb_pclk");