Re: [PATCH] ALSA: pcm: Show closed for DISCONNECTED state

[Takashi Iwai]

On Fri, 19 Jun 2026 11:29:36 +0200,
Ai Chao wrote:
> 
> Hello Takashi
> 
> > Right, I suspect that it might be the case.
> > Does the change like below help (or worsen) anything?
> 
> We tested this solution and verified its feasibility.

OK, then I'm going to submit a proper patch later.

As it's a bit drastic change and it's already in a merge window for
7.2, I'd postpone the fix for 7.3.


thanks,

Takashi

> 
> Thanks,
> Ai Chao
> 
> --- a/sound/core/pcm_native.c
> +++ b/sound/core/pcm_native.c
> @@ -3907,6 +3907,8 @@ static vm_fault_t snd_pcm_mmap_data_fault(struct vm_fault *vmf)
>      if (substream == NULL)
>          return VM_FAULT_SIGBUS;
>      runtime = substream->runtime;
> +    if (runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
> +        return VM_FAULT_SIGBUS;
>      offset = vmf->pgoff << PAGE_SHIFT;
>      dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
>      if (offset > dma_bytes - PAGE_SIZE)
>