linux-kernel - Re: [PATCH 01/10] Revert "drm/msm: Add missing check and destroy for alloc_ordered

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Message-ID: <42ce6819-8a56-83ab-13c9-f49b3167b42e@linaro.org>
Date:   Tue, 28 Mar 2023 15:49:49 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Johan Hovold <johan+linaro@...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, Jiasheng Jiang <jiasheng@...as.ac.cn>
Subject: Re: [PATCH 01/10] Revert "drm/msm: Add missing check and destroy for
 alloc_ordered_workqueue"

On 06/03/2023 12:07, Johan Hovold wrote:
> This reverts commit 643b7d0869cc7f1f7a5ac7ca6bd25d88f54e31d0.
> 
> A recent patch that tried to fix up the msm_drm_init() paths with
> respect to the workqueue but only ended up making things worse:
> 
> First, the newly added calls to msm_drm_uninit() on early errors would
> trigger NULL-pointer dereferences, for example, as the kms pointer would
> not have been initialised. (Note that these paths were also modified by
> a second broken error handling patch which in effect cancelled out this
> part when merged.)
> 
> Second, the newly added allocation sanity check would still leak the
> previously allocated drm device.
> 
> Instead of trying to salvage what was badly broken (and clearly not
> tested), let's revert the bad commit so that clean and backportable
> fixes can be added in its place.
> 
> Fixes: 643b7d0869cc ("drm/msm: Add missing check and destroy for alloc_ordered_workqueue")
> Cc: Jiasheng Jiang <jiasheng@...as.ac.cn>
> Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
> ---
>   drivers/gpu/drm/msm/msm_drv.c | 2 --
>   1 file changed, 2 deletions(-)
> 

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>

-- 
With best wishes
Dmitry