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

[Ai Chao]

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.

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)