[5.14 regression] "ALSA: core: Add continuous and vmalloc mmap ops" breaks Intel SST audio

[Hans de Goede]

Hi,

On 7/31/21 10:10 AM, Takashi Iwai wrote:
> On Fri, 30 Jul 2021 22:04:00 +0200,
> Hans de Goede wrote:
>>
>> Hi All;,
>>
>> As discussed in the "5.14 regression, Intel SST (BYT) audio no longer works" thread,
>> audio on X86 devices using the Intel SST driver no longer works with 5.14.
>>
>> After poking at this for a while I've found the culprit:
>> 30b7ba6972d5 ("ALSA: core: Add continuous and vmalloc mmap ops")
>>
>> If I revert that single commit then everything works fine again with 5.14.
> 
> Does the patch below fix the problem?

Yes that seems to fix things, thank you.

Regards,

Hans



> ---
> --- a/sound/core/memalloc.c
> +++ b/sound/core/memalloc.c
> @@ -215,7 +215,7 @@ static int snd_dma_continuous_mmap(struct snd_dma_buffer *dmab,
>  				   struct vm_area_struct *area)
>  {
>  	return remap_pfn_range(area, area->vm_start,
> -			       dmab->addr >> PAGE_SHIFT,
> +			       page_to_pfn(virt_to_page(dmab->area)),
>  			       area->vm_end - area->vm_start,
>  			       area->vm_page_prot);
>  }
>