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Message-ID: <Yr29pxQPgGs6/0yr@kroah.com>
Date: Thu, 30 Jun 2022 17:13:43 +0200
From: Greg KH <gregkh@...uxfoundation.org>
To: Yang Yingliang <yangyingliang@...wei.com>
Cc: linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org,
geert+renesas@...der.be, peter@...leysoftware.com,
sjoerd.simons@...labora.co.uk
Subject: Re: [PATCH 2/2] serial: sh-sci: fix missing uart_unregister_driver()
in sci_probe_single()
On Thu, Jun 30, 2022 at 10:09:19PM +0800, Yang Yingliang wrote:
> Add missing uart_unregister_driver() in error case in sci_probe_single().
>
> Fixes: 352b92664549 ("serial: sh-sci: Move uart_register_driver call to device probe")
> Reported-by: Hulk Robot <hulkci@...wei.com>
> Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
> ---
> drivers/tty/serial/sh-sci.c | 6 +++++-
> 1 file changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c
> index ca5a58f01aff..08a249eaaa8c 100644
> --- a/drivers/tty/serial/sh-sci.c
> +++ b/drivers/tty/serial/sh-sci.c
> @@ -3280,7 +3280,7 @@ static int sci_probe_single(struct platform_device *dev,
>
> ret = sci_init_single(dev, sciport, index, p, false);
> if (ret)
> - return ret;
> + goto err_unregister;
>
> sciport->gpios = mctrl_gpio_init(&sciport->port, 0);
> if (IS_ERR(sciport->gpios)) {
> @@ -3306,6 +3306,10 @@ static int sci_probe_single(struct platform_device *dev,
>
> err_cleanup_single:
> sci_cleanup_single(sciport);
> +err_unregister:
> + mutex_lock(&sci_uart_registration_lock);
> + uart_unregister_driver(&sci_uart_driver);
> + mutex_unlock(&sci_uart_registration_lock);
Did you test this?
I think you just broke all other devices attached to this driver.
Please always test your code before submitting it, especially for stuff
like this.
thanks,
greg k-h
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