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

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Date:	Sat, 7 Feb 2015 17:49:31 +0100
From:	Thomas Niederprüm <niederp@...sik.uni-kl.de>
To:	Maxime Ripard <maxime.ripard@...e-electrons.com>
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.

Am Sat, 7 Feb 2015 12:45:34 +0100
schrieb Maxime Ripard <maxime.ripard@...e-electrons.com>:

> 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 :)

Will be added.

> 
> > 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.

I agree. I will remove the check for the return statement.

> 
> Maxime
> 

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