linux-kernel - Re: [PATCH] serial: tegra: Add missing clk_disable_unprepare() in tegra_uart_hw

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Date:   Fri, 25 Nov 2022 12:19:40 +0100
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     yiyang13@...wei.com
Cc:     gregkh@...uxfoundation.org, jirislaby@...nel.org,
        jonathanh@...dia.com, kyarlagadda@...dia.com, ldewangan@...dia.com,
        linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org,
        linux-tegra@...r.kernel.org, thierry.reding@...il.com
Subject: Re: [PATCH] serial: tegra: Add missing clk_disable_unprepare() in
 tegra_uart_hw_init()

Le 25/11/2022 à 11:11, Yi Yang a écrit :
> Add the missing clk_disable_unprepare() before return from
> tegra_uart_hw_init() in the error handling path.
> 
> Fixes: cc9ca4d95846 ("serial: tegra: Only print FIFO error message when an error occurs")
> Fixes: d781ec21bae6 ("serial: tegra: report clk rate errors")
> Signed-off-by: Yi Yang <yiyang13-hv44wF8Li93QT0dZR+AlfA@...lic.gmane.org>
> ---
>   drivers/tty/serial/serial-tegra.c | 2 ++
>   1 file changed, 2 insertions(+)
> 

Hi,

I think that it is also missing in tegra_uart_startup() if an error 
occurs after a successful tegra_uart_hw_init() call.

Or maybe (based on function mane) tegra_uart_hw_deinit() should called 
there.

Just my 2c.

CJ


> diff --git a/drivers/tty/serial/serial-tegra.c b/drivers/tty/serial/serial-tegra.c
> index e5b9773db5e3..abc5039eb273 100644
> --- a/drivers/tty/serial/serial-tegra.c
> +++ b/drivers/tty/serial/serial-tegra.c
> @@ -1046,6 +1046,7 @@ static int tegra_uart_hw_init(struct tegra_uart_port *tup)
>   	if (tup->cdata->fifo_mode_enable_status) {
>   		ret = tegra_uart_wait_fifo_mode_enabled(tup);
>   		if (ret < 0) {
> +			clk_disable_unprepare(tup->uart_clk);
>   			dev_err(tup->uport.dev,
>   				"Failed to enable FIFO mode: %d\n", ret);
>   			return ret;
> @@ -1067,6 +1068,7 @@ static int tegra_uart_hw_init(struct tegra_uart_port *tup)
>   	 */
>   	ret = tegra_set_baudrate(tup, TEGRA_UART_DEFAULT_BAUD);
>   	if (ret < 0) {
> +		clk_disable_unprepare(tup->uart_clk);
>   		dev_err(tup->uport.dev, "Failed to set baud rate\n");
>   		return ret;
>   	}