linux-kernel - Re: [PATCH 00/10] drm/msm: fix bind error handling

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Message-ID: <6b2f4d0d-ba39-dd2b-e41e-b5accb4df1a2@linaro.org>
Date:   Tue, 21 Mar 2023 17:21:56 +0200
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Johan Hovold <johan@...nel.org>, Rob Clark <robdclark@...il.com>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>
Cc:     Sean Paul <sean@...rly.run>, David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>, linux-arm-msm@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 00/10] drm/msm: fix bind error handling

On 21/03/2023 15:02, Johan Hovold wrote:
> On Mon, Mar 06, 2023 at 11:07:12AM +0100, Johan Hovold wrote:
>> I had reasons to look closer at the MSM DRM driver error handling and
>> realised that it had suffered from a fair amount of bit rot over the
>> years.
>>
>> Unfortunately, I started fixing this in my 6.2 branch and failed to
>> notice two partial and, as it turned out, broken attempts to address
>> this that are now in 6.3-rc1.
>>
>> Instead of trying to salvage this incrementally, I'm reverting the two
>> broken commits so that clean and backportable fixes can be added in
>> their place.
>>
>> Included are also two related cleanups.
> 
> Any further comments to these patches (except for 9/10, which should be
> dropped)?
> 
> As the patches being reverted here were first added in 6.3-rc1 there is
> still time to get this into 6.3-rc (e.g. before AUTOSEL starts trying to
> backport them).

I will take a look at the patches. Additional question, as you have been 
looking into this area. We have plenty of code which is only called 
under the `if (kms)` condition. Could you hopefully move these parts to 
separate functions, so that the error handling is also simpler? If not, 
I'll put this to my todo list, but it might take some time before I have 
time for that.

> 
> Johan
> 
>> Johan Hovold (10):
>>    Revert "drm/msm: Add missing check and destroy for
>>      alloc_ordered_workqueue"
>>    Revert "drm/msm: Fix failure paths in msm_drm_init()"
>>    drm/msm: fix NULL-deref on snapshot tear down
>>    drm/msm: fix NULL-deref on irq uninstall
>>    drm/msm: fix drm device leak on bind errors
>>    drm/msm: fix vram leak on bind errors
>>    drm/msm: fix missing wq allocation error handling
>>    drm/msm: fix workqueue leak on bind errors
>>    drm/msm: use drmm_mode_config_init()
>>    drm/msm: move include directive
>>
>>   drivers/gpu/drm/msm/disp/msm_disp_snapshot.c |  3 -
>>   drivers/gpu/drm/msm/msm_drv.c                | 67 +++++++++++++-------
>>   2 files changed, 44 insertions(+), 26 deletions(-)

-- 
With best wishes
Dmitry