linux-kernel - [PATCH] serial: 8250_dw: Disable clock on error

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Date:   Wed, 6 Dec 2017 16:46:12 +0100
From:   Stefan Potyra <Stefan.Potyra@...ktrobit.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>, linux-serial@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     ldv-project@...uxtesting.org
Subject: [PATCH] serial: 8250_dw: Disable clock on error

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.Potyra@...ktrobit.com>
---
 drivers/tty/serial/8250/8250_dw.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c
index 5bb0c42c88dd..bda75d317d24 100644
--- a/drivers/tty/serial/8250/8250_dw.c
+++ b/drivers/tty/serial/8250/8250_dw.c
@@ -515,7 +515,8 @@ static int dw8250_probe(struct platform_device *pdev)
 	/* 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");
-- 
2.15.1