mirrors
/
linux-stable
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
1
0
Fork 0
Code Issues Releases Wiki Activity

serial: 8250_bcm2835aux: Add missing clk_disable_unprepare() 

[ Upstream commit b9f1736e47 ]

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: fcc446c8aa ("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>
This commit is contained in:
Guo Mengqi 2022-07-15 10:33:12 +08:00 committed by Greg Kroah-Hartman
parent e0274da3ac
commit b6fe0365f1
1 changed files with 4 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/tty/serial/8250/8250_bcm2835aux.c
View File

@ -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,