linux-kernel - Re: build failure of next-20220830 due to 5f8cdece42ff ("drm/msm/dsi: switch to DRM_PANEL

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Message-ID: <Yw4FQm6V7d3MuMKG@dev-arch.thelio-3990X>
Date:   Tue, 30 Aug 2022 05:40:34 -0700
From:   Nathan Chancellor <nathan@...nel.org>
To:     "Sudip Mukherjee (Codethink)" <sudipm.mukherjee@...il.com>
Cc:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Rob Clark <robdclark@...il.com>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...ux.ie>,
        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, linux-next@...r.kernel.org,
        clang-built-linux <llvm@...ts.linux.dev>
Subject: Re: build failure of next-20220830 due to 5f8cdece42ff
 ("drm/msm/dsi: switch to DRM_PANEL_BRIDGE")

Hi Sudip,

On Tue, Aug 30, 2022 at 10:18:43AM +0100, Sudip Mukherjee (Codethink) wrote:
> Hi All,
> 
> The builds of arm64 allmodconfig with clang have failed to build
> next-20220830 with the error:
> 
> drivers/gpu/drm/msm/dsi/dsi_host.c:1903:14: error: variable 'device_node' is uninitialized when used here [-Werror,-Wuninitialized]
>         of_node_put(device_node);
>                     ^~~~~~~~~~~
> drivers/gpu/drm/msm/dsi/dsi_host.c:1870:44: note: initialize the variable 'device_node' to silence this warning
>         struct device_node *endpoint, *device_node;
>                                                   ^
>                                                    = NULL
> 
> git bisect pointed to 5f8cdece42ff ("drm/msm/dsi: switch to DRM_PANEL_BRIDGE")
> 
> I will be happy to test any patch or provide any extra log if needed.

Thanks for the report. I noticed this yesterday and sent a patch:

https://lore.kernel.org/20220829165450.217628-1-nathan@kernel.org/
https://github.com/ClangBuiltLinux/linux/issues/1700

Cheers,
Nathan