linux-kernel - Re: [PATCH 07/25] serial: sh-sci: Convert from clk_get() to devm_clk

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Date:	Thu, 19 Nov 2015 22:38:34 +0200
From:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:	Geert Uytterhoeven <geert+renesas@...der.be>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Simon Horman <horms@...ge.net.au>,
	Magnus Damm <magnus.damm@...il.com>,
	Yoshinori Sato <ysato@...rs.sourceforge.jp>,
	linux-serial@...r.kernel.org, linux-sh@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 07/25] serial: sh-sci: Convert from clk_get() to devm_clk_get()

Hi Geert,

Thank for the patch.

On Thursday 19 November 2015 19:38:46 Geert Uytterhoeven wrote:
> Transfer clock cleanup handling to the core device management code.
> 
> Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
> ---
>  drivers/tty/serial/sh-sci.c | 8 +++-----
>  1 file changed, 3 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c
> index cba51da604253db6..9442961a198378c7 100644
> --- a/drivers/tty/serial/sh-sci.c
> +++ b/drivers/tty/serial/sh-sci.c
> @@ -2216,7 +2216,7 @@ static struct uart_ops sci_uart_ops = {
>  static int sci_init_clocks(struct sci_port *sci_port, struct device *dev)
>  {
>  	/* Get the SCI functional clock. It's called "fck" on ARM. */
> -	sci_port->fclk = clk_get(dev, "fck");
> +	sci_port->fclk = devm_clk_get(dev, "fck");

Have you tested what happens if you unbind the device from the driver while 
userspace has the serial port open ?

>  	if (PTR_ERR(sci_port->fclk) == -EPROBE_DEFER)
>  		return -EPROBE_DEFER;
>  	if (!IS_ERR(sci_port->fclk))
> @@ -2226,7 +2226,7 @@ static int sci_init_clocks(struct sci_port *sci_port,
> struct device *dev) * But it used to be called "sci_ick", and we need to
> maintain DT * backward compatibility.
>  	 */
> -	sci_port->fclk = clk_get(dev, "sci_ick");
> +	sci_port->fclk = devm_clk_get(dev, "sci_ick");
>  	if (PTR_ERR(sci_port->fclk) == -EPROBE_DEFER)
>  		return -EPROBE_DEFER;
>  	if (!IS_ERR(sci_port->fclk))
> @@ -2236,7 +2236,7 @@ static int sci_init_clocks(struct sci_port *sci_port,
> struct device *dev) * Not all SH platforms declare a clock lookup entry for
> SCI devices, * in which case we need to get the global "peripheral_clk"
> clock. */
> -	sci_port->fclk = clk_get(dev, "peripheral_clk");
> +	sci_port->fclk = devm_clk_get(dev, "peripheral_clk");
>  	if (!IS_ERR(sci_port->fclk))
>  		return 0;
> 
> @@ -2395,8 +2395,6 @@ static int sci_init_single(struct platform_device
> *dev,
> 
>  static void sci_cleanup_single(struct sci_port *port)
>  {
> -	clk_put(port->fclk);
> -
>  	pm_runtime_disable(port->port.dev);
>  }

-- 
Regards,

Laurent Pinchart

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