linux-kernel - Re: [PATCH 8/8] fbdev: ssd1307fb: Turn off display on driver unload.

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Message-ID: <20150207114534.GR2079@lukather>
Date:	Sat, 7 Feb 2015 12:45:34 +0100
From:	Maxime Ripard <maxime.ripard@...e-electrons.com>
To:	niederp@...sik.uni-kl.de
Cc:	linux-fbdev@...r.kernel.org, plagnioj@...osoft.com,
	tomi.valkeinen@...com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 8/8] fbdev: ssd1307fb: Turn off display on driver unload.

On Fri, Feb 06, 2015 at 11:28:14PM +0100, niederp@...sik.uni-kl.de wrote:
> From: Thomas Niederprüm <niederp@...sik.uni-kl.de>
> 

A commit log is always nice :)

> Signed-off-by: Thomas Niederprüm <niederp@...sik.uni-kl.de>
> ---
>  drivers/video/fbdev/ssd1307fb.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/video/fbdev/ssd1307fb.c b/drivers/video/fbdev/ssd1307fb.c
> index 02931c7..be91dfc 100644
> --- a/drivers/video/fbdev/ssd1307fb.c
> +++ b/drivers/video/fbdev/ssd1307fb.c
> @@ -762,6 +762,11 @@ static int ssd1307fb_remove(struct i2c_client *client)
>  {
>  	struct fb_info *info = i2c_get_clientdata(client);
>  	struct ssd1307fb_par *par = info->par;
> +	int ret = 0;
> +
> +	ret = ssd1307fb_write_cmd(par->client, SSD1307FB_DISPLAY_OFF);
> +	if (ret < 0)
> +		return ret;

I don't think we really care about the return value here.

It might be even worse actually, since you'll end up in a intermediate
state, where you won't have freed everything, but your remove method
has been called still.

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

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