From: Guo Mengqi guomengqi3@huawei.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@huawei.com Reviewed-by: Florian Fainelli f.fainelli@gmail.com Signed-off-by: Guo Mengqi guomengqi3@huawei.com Link: https://lore.kernel.org/r/20220715023312.37808-1-guomengqi3@huawei.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Sasha Levin sashal@kernel.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,