linux-kernel - Re: [PATCH v2 2/3] iommu/sound: Use component_match_add

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Message-ID: <832f3200-77ac-1ee0-e1b5-5f56353cba36@arm.com>
Date:   Tue, 3 Jan 2023 16:39:59 +0000
From:   Robin Murphy <robin.murphy@....com>
To:     Maxime Ripard <maxime@...no.tech>
Cc:     Sean Anderson <sean.anderson@...o.com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Joerg Roedel <joro@...tes.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Takashi Iwai <tiwai@...e.com>, Will Deacon <will@...nel.org>,
        Yong Wu <yong.wu@...iatek.com>, alsa-devel@...a-project.org,
        iommu@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH v2 2/3] iommu/sound: Use component_match_add_of helper

On 03/01/2023 4:15 pm, Maxime Ripard wrote:
> Hi Robin,
> 
> On Tue, Jan 03, 2023 at 01:01:07PM +0000, Robin Murphy wrote:
>> Hi Sean,
>>
>> On 22/12/2022 11:37 pm, Sean Anderson wrote:
>>> Convert users of component_match_add_release with component_release_of
>>> and component_compare_of to component_match_add_of.
>>>
>>> Signed-off-by: Sean Anderson <sean.anderson@...o.com>
>>> Acked-by: Mark Brown <broonie@...nel.org>
>>> ---
>>>
>>> Changes in v2:
>>> - Split off from helper addition
>>>
>>>    drivers/iommu/mtk_iommu.c    | 3 +--
>>>    drivers/iommu/mtk_iommu_v1.c | 3 +--
>>>    sound/soc/codecs/wcd938x.c   | 6 ++----
>>>    3 files changed, 4 insertions(+), 8 deletions(-)
>>>
>>> diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
>>> index 2ab2ecfe01f8..483b7a9e4410 100644
>>> --- a/drivers/iommu/mtk_iommu.c
>>> +++ b/drivers/iommu/mtk_iommu.c
>>> @@ -1079,8 +1079,7 @@ static int mtk_iommu_mm_dts_parse(struct device *dev, struct component_match **m
>>>    		}
>>>    		data->larb_imu[id].dev = &plarbdev->dev;
>>> -		component_match_add_release(dev, match, component_release_of,
>>> -					    component_compare_of, larbnode);
>>> +		component_match_add_of(dev, match, larbnode);
>>
>> I've long since given up trying to make sense of how the DRM tree works, but
>> the conflicting change is definitely already in mainline:
>>
>> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=b5765a1b44bea9dfcae69c53ffeb4c689d0922a7
> 
> As far as I can see, that patch doesn't affect DRM at all, and the
> commit you pointed to doesn't either, nor has it been merged through the
> DRM tree.

Right it doesn't affect DRM, and was merged via the IOMMU tree, but it 
does affect *this* patch, which Sean has based on a drm-next branch that 
seemingly still wasn't up to date with 6.2-rc1 at the time.

Since v2 had already been posted, it seemed like a bright idea to 
comment here to clarify that it was still relevant, rather than bumping 
the old thread to reply directly. Apologies for any confusion.

In practical terms I think it's merely a case of dropping this hunk; the 
other one in mtk_iommu_v1.c looks fine to me.

Cheers,
Robin.

> Can you expand a bit on how we're involved in this, what we should
> clarify or help with?
> 
> Maxime