linux-kernel - [PATCH 5.18 0922/1095] serial: 8250_bcm2835aux: Add missing clk_disable

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Date:   Mon, 15 Aug 2022 20:05:21 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Hulk Robot <hulkci@...wei.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Guo Mengqi <guomengqi3@...wei.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.18 0922/1095] serial: 8250_bcm2835aux: Add missing clk_disable_unprepare()

From: Guo Mengqi <guomengqi3@...wei.com>

[ Upstream commit b9f1736e475dba0d6da48fdcb831248ab1597886 ]

The error path when get clock frequency fails in bcm2835aux_serial
driver does not correctly disable the clock.

This flaw was found using a static analysis tool "Hulk Robot", which
reported the following warning when analyzing linux-next/master:

    drivers/tty/serial/8250/8250_bcm2835aux.c:
    warning: clk_disable_unprepare_missing.cocci

The cocci script checks for the existence of clk_disable_unprepare()
paired with clk_prepare_enable().

Add the missing clk_disable_unprepare() to the error path.

Fixes: fcc446c8aa63 ("serial: 8250_bcm2835aux: Add ACPI support")
Reported-by: Hulk Robot <hulkci@...wei.com>
Reviewed-by: Florian Fainelli <f.fainelli@...il.com>
Signed-off-by: Guo Mengqi <guomengqi3@...wei.com>
Link: https://lore.kernel.org/r/20220715023312.37808-1-guomengqi3@huawei.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/tty/serial/8250/8250_bcm2835aux.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/tty/serial/8250/8250_bcm2835aux.c b/drivers/tty/serial/8250/8250_bcm2835aux.c
index 2a1226a78a0c..21939bb44613 100644
--- a/drivers/tty/serial/8250/8250_bcm2835aux.c
+++ b/drivers/tty/serial/8250/8250_bcm2835aux.c
@@ -166,8 +166,10 @@ static int bcm2835aux_serial_probe(struct platform_device *pdev)
 	uartclk = clk_get_rate(data->clk);
 	if (!uartclk) {
 		ret = device_property_read_u32(&pdev->dev, "clock-frequency", &uartclk);
-		if (ret)
-			return dev_err_probe(&pdev->dev, ret, "could not get clk rate\n");
+		if (ret) {
+			dev_err_probe(&pdev->dev, ret, "could not get clk rate\n");
+			goto dis_clk;
+		}
 	}
 
 	/* the HW-clock divider for bcm2835aux is 8,
-- 
2.35.1