linux-kernel - Re: [RFC] [PATCH] drm: adv7511/33: Fix adv7511_cec

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Date:   Mon, 20 Nov 2017 16:06:23 +0100
From:   Hans Verkuil <hverkuil@...all.nl>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     David Airlie <airlied@...ux.ie>,
        lkml <linux-kernel@...r.kernel.org>,
        dri-devel@...ts.freedesktop.org,
        Hans Verkuil <hans.verkuil@...co.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Bhumika Goyal <bhumirks@...il.com>
Subject: Re: [RFC] [PATCH] drm: adv7511/33: Fix adv7511_cec_init() failure
 handling

On 11/20/2017 04:05 PM, Hans Verkuil wrote:
> On 11/17/2017 09:43 AM, Hans Verkuil wrote:
>> If the device tree for a board did not specify a cec clock, then
>> adv7511_cec_init would return an error, which would cause adv7511_probe()
>> to fail and thus there is no HDMI output.
>>
>> There is no need to have adv7511_probe() fail if the CEC initialization
>> fails, so just change adv7511_cec_init() to a void function. In addition,
>> adv7511_cec_init() should just return silently if the cec clock isn't
>> found and show a message for any other errors.
>>
>> An otherwise correct cleanup patch from Dan Carpenter turned this broken
>> failure handling into a kernel Oops, so bisection points to commit
>> 7af35b0addbc ("drm/kirin: Checking for IS_ERR() instead of NULL") rather
>> than 3b1b975003e4 ("drm: adv7511/33: add HDMI CEC support").
>>
>> Based on earlier patches from Arnd and John.
>>
>> Reported-by: Naresh Kamboju <naresh.kamboju@...aro.org>
>> Cc: Xinliang Liu <xinliang.liu@...aro.org>
>> Cc: Dan Carpenter <dan.carpenter@...cle.com>
>> Cc: Sean Paul <seanpaul@...omium.org>
>> Cc: Hans Verkuil <hans.verkuil@...co.com>
>> Cc: Archit Taneja <architt@...eaurora.org>
>> Cc: John Stultz <john.stultz@...aro.org>
>> Link: https://bugs.linaro.org/show_bug.cgi?id=3345
>> Link: https://lkft.validation.linaro.org/scheduler/job/48017#L3551
>> Fixes: 7af35b0addbc ("drm/kirin: Checking for IS_ERR() instead of NULL")
>> Fixes: 3b1b975003e4 ("drm: adv7511/33: add HDMI CEC support")
>> Signed-off-by: Hans Verkuil <hans.verkuil@...co.com>
> 
> I tested this patch on a Dragonboard and a Renesas Koelsch board. I also forced
> errors in parsing the dts or registering the CEC adapter to test those failure
> paths on both boards.
> 
> So:
> 
> Tested-by: Hans Verkuil <hans.verkuil@...co.com>

As far as I am concerned the [RFC] part can be dropped from this patch.

Regards,

	Hans