Re: [RFC] [PATCH] drm: adv7511/33: Fix adv7511_cec_init() failure handling

From: Hans Verkuil
Date: Mon Nov 20 2017 - 10:06:34 EST

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@xxxxxxxxxx>
>> Cc: Xinliang Liu <xinliang.liu@xxxxxxxxxx>
>> Cc: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
>> Cc: Sean Paul <seanpaul@xxxxxxxxxxxx>
>> Cc: Hans Verkuil <hans.verkuil@xxxxxxxxx>
>> Cc: Archit Taneja <architt@xxxxxxxxxxxxxx>
>> Cc: John Stultz <john.stultz@xxxxxxxxxx>
>> Link:
>> Link:
>> 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@xxxxxxxxx>
> 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@xxxxxxxxx>

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