linux-kernel - [PATCH AUTOSEL for 4.15 26/78] serial: 8250

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Message-ID: <20180308045525.7662-26-alexander.levin@microsoft.com>
Date:   Thu, 8 Mar 2018 04:56:12 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
CC:     Stefan Potyra <Stefan.Potyra@...ktrobit.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL for 4.15 26/78] serial: 8250_dw: Disable clock on
 error

From: Stefan Potyra <Stefan.Potyra@...ktrobit.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.Potyra@...ktrobit.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.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 7070203e3157..cd1b94a0f451 100644
--- a/drivers/tty/serial/8250/8250_dw.c
+++ b/drivers/tty/serial/8250/8250_dw.c
@@ -509,7 +509,8 @@ 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");
-- 
2.14.1