linux-kernel - Re: [PATCH 1/2] drm/rockchip: dw_hdmi: Call drm_encoder

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Date:	Mon, 07 Mar 2016 16:37:03 +0800
From:	Mark yao <mark.yao@...k-chips.com>
To:	Russell King - ARM Linux <linux@....linux.org.uk>,
	John Keeping <john@...ping.me.uk>
CC:	Douglas Anderson <dianders@...omium.org>,
	Heiko Stuebner <heiko@...ech.de>,
	David Airlie <airlied@...ux.ie>, linux-kernel@...r.kernel.org,
	dri-devel@...ts.freedesktop.org,
	linux-rockchip@...ts.infradead.org,
	Daniel Kurtz <djkurtz@...omium.org>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 1/2] drm/rockchip: dw_hdmi: Call drm_encoder_cleanup()
 in error path

On 2016年03月05日 20:39, Russell King - ARM Linux wrote:
> On Sat, Mar 05, 2016 at 12:11:16PM +0000, John Keeping wrote:
>> On Fri, Mar 04, 2016 at 03:22:01PM -0800, Douglas Anderson wrote:
>>> The drm_encoder_cleanup() was missing both from the error path of
>>> dw_hdmi_rockchip_bind().  This caused a crash when slub_debug was
>>> enabled and we ended up deferring probe of HDMI at boot.
>>>
>>> This call isn't needed from unbind() because if dw_hdmi_bind() returns
>>> no error then it takes over the job of freeing the encoder (in
>>> dw_hdmi_unbind).
>>>
>>> Signed-off-by: Douglas Anderson <dianders@...omium.org>
>>> ---
>> Does dw_hdmi-imx need a similar change?  I wonder if it would be cleaner
>> to push this into dw_hdmi_bind() if it affects all of the platforms..
> I don't think moving it there would make sense - keep the initialisation
> and cleanup together in the same file so that it's contained together.
>

I don't like this patch too, initialisation and cleanup not in the same 
file looks bad,

How about:

drivers/gpu/drm/bridge/dw-hdmi.c
void dw_hdmi_unbind(struct device *dev, struct device *master, void *data)
         hdmi_writeb(hdmi, ~0, HDMI_IH_MUTE_PHY_STAT0);

hdmi->connector.funcs->destroy(&hdmi->connector);
-       hdmi->encoder->funcs->destroy(hdmi->encoder);

drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c
static int dw_hdmi_rockchip_bind(struct device *dev, struct device *master,

-       return dw_hdmi_bind(dev, master, data, encoder, iores, irq, 
plat_data);
+       ret = dw_hdmi_bind(dev, master, data, encoder, iores, irq, 
plat_data);
+       if (ret)
+               drm_encoder_cleanup(encoder);
+
+       return ret;
  }

  static void dw_hdmi_rockchip_unbind(struct device *dev, struct device 
*master,
                                     void *data)
  {
+       drm_encoder_cleanup(...);
         return dw_hdmi_unbind(dev, master, data);
  }

Thanks.

-- 
Ｍark Yao