[PATCH] virtio-console: avoid DMA from vmalloc area

[Xianting Tian]

在 2021/7/28 下午5:01, Arnd Bergmann 写道:
> On Wed, Jul 28, 2021 at 10:28 AM Xianting Tian
> <xianting.tian at linux.alibaba.com> wrote:
>> 在 2021/7/28 下午3:25, Arnd Bergmann 写道:
>>
>> I checked several hvc backends, like drivers/tty/hvc/hvc_riscv_sbi.c,
>> drivers/tty/hvc/hvc_iucv.c, drivers/tty/hvc/hvc_rtas.c, they don't use dma.
>>
>> I not finished all hvc backends check yet. But I think even if all hvc
>> backends don't use dma currently, it is still possible that the hvc
>> backend using dma will be added in the furture.
>>
>> So I agree with you it should better be fixed in the hvc framework,
>> solve the issue in the first place.
> Ok, sounds good to me, no need to check more backends then.
> I see the hvc-console driver is listed as 'Odd Fixes' in the maintainer
> list, with nobody assigned other than the ppc kernel list (added to Cc).
>
> Once you come up with a fix in hvc_console.c, please send that to the
> tty maintainers, the ppc list and me, and I'll review it.
OK, thanks, I will submit the patch ASAP :)
>
>          Arnd