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

["Ming Qian(OSS)" <ming.qian@oss.nxp.com>]

Hi Marco,

On 3/5/2026 5:01 PM, Marco Felsch wrote:
> Hi Ming,
> 
> On 26-03-05, 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.
>>
>> Use __initconst_or_module to keep the data available when built
>> as a module while still allowing it to be freed when built-in.
> 
> would be nice if I get at least some credit for pointing to the correct
> fix ;)

I'm sorry that I forget to add your Suggested-by tag.
I will include a Suggested-by tag in the next revision.
Appreciate your help.

Regards,
Ming

> 
>> Fixes: e0203ddf9af7 ("media: verisilicon: Avoid G2 bus error while decoding H.264 and HEVC")
>> Signed-off-by: Ming Qian <ming.qian@oss.nxp.com>
> 
> However, patch looks fine:
> 
> Reviewed-by: Marco Felsch <m.felsch@pengutronix.de>
> 
>> ---
>>   drivers/media/platform/verisilicon/imx8m_vpu_hw.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/media/platform/verisilicon/imx8m_vpu_hw.c b/drivers/media/platform/verisilicon/imx8m_vpu_hw.c
>> index 6f8e43b7f157..fa429e6e8281 100644
>> --- a/drivers/media/platform/verisilicon/imx8m_vpu_hw.c
>> +++ b/drivers/media/platform/verisilicon/imx8m_vpu_hw.c
>> @@ -343,7 +343,7 @@ const struct hantro_variant imx8mq_vpu_variant = {
>>   	.num_regs = ARRAY_SIZE(imx8mq_reg_names)
>>   };
>>   
>> -static const struct of_device_id imx8mq_vpu_shared_resources[] __initconst = {
>> +static const struct of_device_id imx8mq_vpu_shared_resources[] __initconst_or_module = {
>>   	{ .compatible = "nxp,imx8mq-vpu-g1", },
>>   	{ .compatible = "nxp,imx8mq-vpu-g2", },
>>   	{ /* sentinel */ }
>> -- 
>> 2.52.0
>>
>>
>