Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Message-ID: <42ce6819-8a56-83ab-13c9-f49b3167b42e@linaro.org>
Date:   Tue, 28 Mar 2023 15:49:49 +0300
MIME-Version: 1.0
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101
 Thunderbird/102.9.0
Subject: Re: [PATCH 01/10] Revert "drm/msm: Add missing check and destroy for
 alloc_ordered_workqueue"
Content-Language: en-GB
To:     Johan Hovold <johan+linaro@kernel.org>,
        Rob Clark <robdclark@gmail.com>,
        Abhinav Kumar <quic_abhinavk@quicinc.com>
Cc:     Sean Paul <sean@poorly.run>, David Airlie <airlied@gmail.com>,
        Daniel Vetter <daniel@ffwll.ch>, linux-arm-msm@vger.kernel.org,
        dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org,
        linux-kernel@vger.kernel.org, Jiasheng Jiang <jiasheng@iscas.ac.cn>
References: <20230306100722.28485-1-johan+linaro@kernel.org>
 <20230306100722.28485-2-johan+linaro@kernel.org>
From:   Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
In-Reply-To: <20230306100722.28485-2-johan+linaro@kernel.org>
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 7bit
Precedence: bulk

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@iscas.ac.cn>
> Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
> ---
>   drivers/gpu/drm/msm/msm_drv.c | 2 --
>   1 file changed, 2 deletions(-)
> 

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

-- 
With best wishes
Dmitry