linux-kernel - Re: [PATCH 09/11] drm/panel: Add support for the Raspberry Pi 7" Touchscreen.

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Message-ID: <20170131213849.GD872@mithrandir.ba.sec>
Date:   Tue, 31 Jan 2017 22:38:51 +0100
From:   Thierry Reding <thierry.reding@...il.com>
To:     Eric Anholt <eric@...olt.net>, Mark Rutland <mark.rutland@....com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Stephen Warren <swarren@...dotorg.org>,
        Michael Turquette <mturquette@...libre.com>,
        Lee Jones <lee@...nel.org>,
        Stephen Boyd <sboyd@...eaurora.org>,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        Rob Herring <robh+dt@...nel.org>,
        bcm-kernel-feedback-list@...adcom.com,
        linux-rpi-kernel@...ts.infradead.org, linux-clk@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 09/11] drm/panel: Add support for the Raspberry Pi 7"
 Touchscreen.

On Tue, Jan 31, 2017 at 10:19:52PM +0100, Daniel Vetter wrote:
> On Tue, Jan 31, 2017 at 10:07:19PM +0100, Thierry Reding wrote:
> > On Wed, Dec 14, 2016 at 11:46:19AM -0800, Eric Anholt wrote:
> > > +static int rpi_touchscreen_dsi_remove(struct mipi_dsi_device *dsi)
> > > +{
> > > +	struct device *dev = &dsi->dev;
> > > +	struct rpi_touchscreen *ts = dev_get_drvdata(dev);
> > > +	int ret;
> > > +
> > > +	ret = mipi_dsi_detach(dsi);
> > > +	if (ret < 0) {
> > > +		dev_err(&dsi->dev, "failed to detach from DSI host: %d\n", ret);
> > > +		return ret;
> > > +	}
> > 
> > You might want to continue after this anyway, because the driver will be
> > unloaded regardless of your error code and you'll leave behind a
> > dangling panel and leak a reference to the I2C bridge.
> 
> Sounds like we should switch the mipi_dsi_driver->remove callback to
> return void then? But separate cleanup series if someone bothers with it.

I think there are advantages to keeping this consistent with the driver
core's definition of ->remove(). There have been efforts lately to deny
unloading drivers if they are a dependency for other drivers, so we may
yet see the day where the driver core actually does something with this
return value.

Thierry

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