Re: [PATCH v4] media: verisilicon: Fix kernel panic due to __initconst misuse

Francesco Dolcini
2026-03-12T17:34:30Z

Hello,

On Fri, Mar 06, 2026 at 11:10:57AM +0800, ming.qian@oss.nxp.com wrote:
> From: Ming Qian <ming.qian@oss.nxp.com>
>
> Fix a kernel panic when probing the driver as a module:
>
> Unable to handle kernel paging request at virtual address
> ffffd9c18eb05000
> of_find_matching_node_and_match+0x5c/0x1a0
> hantro_probe+0x2f4/0x7d0 [hantro_vpu]
>
> The imx8mq_vpu_shared_resources array is referenced by variant
> structures through their shared_devices field. When built as a
> module, __initconst causes this data to be freed after module
> init, but it's later accessed during probe, causing a page fault.
>
> The imx8mq_vpu_shared_resources is referenced from non-init code,
> so keeping __initconst or __initconst_or_module here is wrong.
>
> Drop the __initconst annotation and let it live in the normal .rodata
> section.
>
> A bug of __initconst called from regular non-init probe code
> leading to bugs during probe deferrals or during unbind-bind cycles.
>
> Reported-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
> Closes: https://lore.kernel.org/all/68ef934f-baa0-4bf6-93d8-834bbc441e66@kernel.org/
> Reported-by: Franz Schnyder <franz.schnyder@toradex.com>
> Closes: https://lore.kernel.org/all/n3qmcb62tepxltoskpf7ws6yiirc2so62ia23b42rj3wlmpl67@rvkbuirx7kkp/
> Fixes: e0203ddf9af7 ("media: verisilicon: Avoid G2 bus error while decoding H.264 and HEVC")
> Suggested-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
> Suggested-by: Marco Felsch <m.felsch@pengutronix.de>
> Reviewed-by: Marco Felsch <m.felsch@pengutronix.de>
> Signed-off-by: Ming Qian <ming.qian@oss.nxp.com>

What's the plan to merge this? It fixes a quite severe regression,
a boot failure.

#regzbot introduced: e0203ddf9af7

Thanks,
Francesco